Many people believe the Israelites were enslaved in Egypt for 400 years based on what is written in Genesis 15:13 or 430 years based on what it says in Exodus 12:40. However, the Israelites couldn’t have been enslaved in Egypt for 400 or 430 years. The issue is that these numbers conflict with the math in the story; in actuality, they couldn’t have been in Egypt for more than 350 years.
The 400 years in Genesis 15:13 and the 430 years in Exodus 12:40 are two separate numbers for two separate aspects of the Israelites’ history. Moses was 80 when the Israelites left Egypt (Exodus 7:7), Moses’ father Amram lived until age 137 (Exodus 6:20), and Moses’ grandfather Kohath lived until age 133 (Exodus 6:18). Kohath was one of the 66 people who left Canaan for Egypt with Jacob (Gen 46:8-26 [v11 mentions Kohath]). If Kohath was born the year Jacob went to Egypt, and his son and grandson were each born the year their fathers died, then 133+137+80 is a maximum of 350 years. So, the Israelites COULDN’T have been in Egypt for over 350 years. The 430 years in Exodus 12:40 are a count from the time Abraham received the promise at 75 years old to the time Moses led the Israelites out of Egypt at age 80. This is explained by Paul in Galatians 3:16-17 and confirmed by Flavius Josephus, a Jewish historian from the 1st Century.
There are two explanations that I’ve seen for this discrepancy: one is that the KJV is the only correct translation of the Masoretic Text, and the other is that the Masoretic text is wrong and Septuagint/Samaritan Pentateuch got it right by including Canaan in Ex 12:40. Both explanations actually lead to the same conclusion so it doesn’t matter which side you take in the Masoretic Text vs Septuagint debate on this issue. For clarification, there are two versions of the Old Testament, the Hebrew Masoretic Text and the Greek Septuagint. The Masoretic Text is written in Hebrew and is dated around 900-1100 AD. Some suspect that Jews tampered with it to cover up messianic prophecies. On the other side is the Septuagint (aka the LXX), a Greek translation of the Old Testament that goes back before the time of Jesus to around 300 BC. Many favor this manuscript because it is older, but some suspect that the predecessors of the Sadducees corrupted this text. The Sadducees adopted some Greek philosophy and denied things like resurrection because some Greeks were anti-supernatural rationalists. This has made some people suspicious of its consistency, so they trust that the Jews preserved God’s word better in its original language at the end of the first millennium AD than the Greek Septuagint did pre-Christ. The Masoretic Text preserved the Hebrew language in an era when layman (non-religious scholar) Jews did not speak Hebrew. Hebrew had fallen out of use by the laymen and had been replaced by Aramaic, Greek, and eventually other languages. One of the most significant discrepancies between them is the patriarchs’ ages between the time of Noah and Abraham in Genesis 10-11. In the Masoretic Text, there are about 350 years between the flood and the birth of Abraham. In the Greek Septuagint, the ages of the patriarchs are all extended by around 750 years. Different people have different views, which is irrelevant to this discussion because, again, both sides actually agree on this issue. More on this topic here.
The Masoretic to KJV explanation:
Ex 12:40 (KJV) 40 Now the sojourning of the children of Israel, who dwelt in Egypt, was four hundred and thirty years.
Many modern English translations of Ex 12:40 say the Israelites were in Egypt for 430 years. However, in the KJV, Exodus 12:40 does not say that they dwelt in Egypt for 430 years but rather, the time of the “SOJOURNING OF the children of Israel, WHO dwelt in Egypt, was 430 years.” It defines the children of Israel by saying they are the people WHO are about to experience God’s promise to their ancestor Abraham, which was made 430 years ago, because they are going to the promised land. Also, slaves don’t sojourn since slaves are in bondage, so the sojourning started with Abraham. Abraham went to Canaan, but he did not inherit it; he only sojourned in it as a foreigner. The land was promised to Abraham’s descendants (seed), not him specifically. This sojourning for 430 years is from the time of Abraham to the Exodus, just as Paul says in Galatians 3:16-17. The text of Ex 12:40 does not say they had been IN Egypt for 430 years. To translate it as they lived in Egypt for 430 years is an incorrect text rendering. This kind of thing happens in various Bible translations and is something to always pay attention to.
The Septuagint Explanation:
Ex 12:40 The people of Israel had lived in Egypt [and Canaan] for 430 years.
The pro-Septuagint side suggests that the Masoretic text dropped “and Canaan” from the verse. In the Septuagint and Samaritan Pentateuch, Ex12:40 says, “The people of Israel had lived in Egypt and Canaan (‘Canaan and Egypt’ in the Samarian version) for 430 years.” However, unlike other English versions, the KJV correctly translates the verse from the Masoretic Text, so we don’t need the Septuagint version of it. The LXX and Samaritan translations are later modifications designed to make it easier for people to understand that the Israelites were not in Egypt for 430 years. Those modern translations that suggest they were in Egypt for 430 most likely tried to mix these two versions together, which made an incorrect mess.
How many years were they in Egypt?
We can add up the years and find out. Abraham’s promise was given at age 75 (Gen 12:3-7). Isaac was born 25 years later (Gen 21:5). When Isaac was 60, he had Jacob (Gen 25:26). Jacob went to Egypt 130 years later (Gen 47:9). So, 25 + 60 + 130 = 215, which is half of 430 years. So, the second half of those 215 years made up the time the Israelites spent in Egypt until the time of 80-year-old Moses and the Exodus. They weren’t enslaved until after Joseph died (Ex 1:8-11), which means they were in Egypt for 215 years, but there were slaves for less than that.
How many years were they enslaved?
Joseph was 30 when the pharaoh appointed him vizier of Egypt (Genesis 41:40-46). Joseph was given this position after interpreting the pharaoh’s dream, which said there would be seven years of abundance, then seven years of famine (Gen 41:53-54). Joseph’s family arrives two years into the 7-year famine (Gen 45:4-28). So Joseph was 39 (30+7+2) when Jacob came to Egypt. Joseph died at 110 (Gen 50:6), which is 71 years after Jacob came to Egypt. So 215-71=144. So they were enslaved for 144 years max and 80 years minimum. It’s possible that the Israelites weren’t enslaved the exact year Joseph died, but some time afterward, when all of Jacob’s sons had passed. Their enslavement is not fixed to 144 or 80 but can be somewhere in between. Joseph died 64 years before Moses’ birth (144-80). If slavery started in between, I believe it would most likely be around 120 years before the Exodus because this is when Levi, the last son of Israel, died. Joseph asked his brothers before he died to ensure their descendants would take his body out of Egypt when they left (Gen 50:24-26). This indicates that some, if not all, of his brothers outlived Joseph. The only other brother we have a death date for is Levi, who died at 137 (Ex 6:16). Joseph was born seven years after Jacob married (when Jacob was 91). We know this because Joseph was 39 when he reunited with Jacob, who was 130 when he moved to Egypt, and who was 130-39=91. Levi was the third son born to Jacob in the seven years he served under Laban while married(Gen 29:34), and Joseph was born at the end of it, so if there were at least one son born each year from all four of Jacob’s women, then Levi would be four years older than Joseph (7-3=4). This means Levi was 114 when Joseph died at 110, so Levi died 23 years later (137-114). This means he died 41 years before Moses’ birth (64-23), 121 years before the Exodus (144-23).
The Genesis 15:13 prophecy conflict:
In Gen 15:13, it was prophesied that Abram’s (Abraham’s) SEED (children/descendants) would be MISTREATED and ENSLAVED in a FOREIGN LAND for 400 years. “Foreign land” refers to both Canaan AND Egypt because Abraham was a foreigner in both since he is from Ur of the Chaldees. Canaan wasn’t his land; he just lived among them as a sojourner. According to the promise, his first “seed” was Isaac (Gen 17:17-22). Isaac was “mistreated” starting from the time he was being bullied by Ishmael in his weaning days (Gen 21:8-9). Paul even reminds us of the time Ishmael persecuted Isaac in Gal 4:29. In addition, Isaac was persecuted by Abimelech in Gen 26. Jacob endured prosecution from his brother Esau (Gen 27-28) and his father-in-law Laban in Aram (Gen 31-32). In addition, he had conflicts with some Canaanites, like the people of Shechem (Gen 34). Then, 215 years after the promise, they moved to Egypt as refugees from Canaan. When they came to Egypt initially for food, they were discriminated against because the Egyptians didn’t like foreigners (Gen 43:32, Gen 46:33-34). Sometime after Joseph died, 71 years later, they were ENSLAVED in Egypt because they were foreigners (Ex1:1-11), and they didn’t have Joseph to protect them from discrimination. In addition, in Genesis 15:14, God says he will judge the nation [Egypt] for their enslavement of Abraham’s descendants, and they will leave [Egypt] with reparations, and this is mentioned in Exodus 3:20-22, Ex 11:1-2, and Ex 12:35-36. Then, in verse 15, God tells Abraham that he will join his ancestors in peace. This is in contrast to everything God just foretold, meaning Abraham himself is not included in the persecution or slavery, so it only applies to Isaac and later generations.
Gen 15:16 After four generations your descendants will return here to this land, for the sins of the Amorites do not yet warrant their destruction.
Lastly, God says in Gen 15:16 that it is in the 4th generation (from the time Jacob’s family came to Egypt) that the Israelites will re-enter Canaan. It says the reason is that the sins of the Amorites didn’t warrant their destruction. The Amorites helped Abraham in Genesis 14 rescue his nephew Lot when he was taken captive from Sodom in a Canaanite Civil War, so at the time, they were blessed for blessing Abraham (Gen 12:1-3). This caused God to delay Canaan’s judgment for 400 years from the time of Abraham. We can look at the lineage of Moses from Levi in Ex 6:14-27 to count the generations. The Torah’s definition of a generation would be 40 years, according to God’s prohibition on the wilderness from entering the promised land because of their disobedience in Num 14:26-35. Jacob and his 12 sons and their families came to Egypt in Gen 46, and verse 11 mentions Kohath (Moses’ paternal grandfather), so Kohath was born in Canaan before they moved to Egypt. That means that generation one of the Israelites born in Egypt included Kohath’s son, Amram. Amram married his aunt Jochebed (the daughter of Levi), and Levi died about 120 years before the Exodus, so Jochebed couldn’t have been any younger than 120 at the time of the Exodus. Amram, who died at 137 years old (Ex 6:20), was likely around the same age or older than her. Moses was 40 years old after Levi died, because he was 80 at the time of the Exodus (Ex 7:7), making him Generation 2 with his siblings, Aaron and Miriam. The 3rd generation is the generation of Joshua and Caleb. Joshua was born when 40-year-old Moses fled Egypt as a fugitive wanted for murder. This was 40 years before the Exodus because Joshua was 40 then (Josh 14:7-10). That leaves their children as the fourth and final generation born in Egypt. The third generation lost the right to enter the promised land except for Joshua and Caleb (Num 14:26-35, Num 20:12, Deut 32:48-52). So, the next generation, ages 19 and under (Num 14:29), would enter Canaan after spending 40 more years in the wilderness. The fourth generation finally entered Canaan under 80-year-old Joshua’s leadership 160 years after Levi died (Moses died at age 120 at this time). This fits because 160 years is four generations if each is 40 years (160=40×40).
Isaac was born 405 years before the Exodus from Egypt (430-25 years). Jewish Talmudic tradition says that weaning happens between 18 months and five years. If you subtract five from 405, then it’s 400 years. That corresponds to when Ishmael started bullying Isaac at his weaning ceremony around Isaac’s 5th birthday. This is why Gen 15:13 mentions a time 30 years less than the 430 years from Abraham’s promise to the Exodus. It seems that 30 years after the promise, when Isaac turned five, Ishmael bullied him while weaning, and that’s when Sarah kicked Hagar and Ishmael out for their persecution of Isaac.
The conclusion here is that Abraham was promised Canaan 430 years before Moses brought the Israelites to Mt. Sinai. Then, 25 years later, Isaac was born. Then, he was persecuted by Hagar (Abraham’s slave) and her son Ishmael (Abraham’s oldest son) during his weaning ceremony five years later, which would be 400 years before the covenant on Mt. Sinai. 215 years after the promise was made, Jacob [Abraham’s grandson from Isaac] and his family moved to Egypt from Canaan to escape famine, and Joseph his son who worked for the Egyptian government had prepared a place for them to live as refugees with the Pharaoh’s permission. Then, 71 years later, Joseph died, and the Israelites were enslaved sometime after that. This could have been as early as the year he died (144 before the Exodus) or as late as the year Moses was born (80 years before the Exodus). Or somewhere in between, like when Levi died (about 121 years before the Exodus). Moses was born 64 years after Joseph died and was 80 when the Exodus occurred, so the Israelites were enslaved for no more than 144 years (64+80) and no less than 80 years. In Galatians 3:16, Paul confirms that the 430 years from Ex 12:40 is about the time from Abraham to Moses, not the time frame for how long the Israelites were enslaved. It mentions the sojourning of Abraham, Isaac, and Jacob in Canaan, as they were persecuted as foreigners but not yet enslaved.
The prophecy of Genesis 15:13-16 starts with Isaac’s persecution by Ishmael 400 years before the Exodus. This leads to Ishmael and his mother being put out, initiating the beginning of strife between Ishmael and Isaac’s descendants. More persecution of Isaac occurred with Abimelech in Gen 26. Then Isaac’s son Jacob dealt with his sibling rivalry with his twin brother Esau and persecution by his father-in-law Laban. His older sons, who were jealous of his favorite son, Joseph, sold him as a slave to Egypt. Eventually, he was elevated to vizier of Egypt and saved the nation from disaster with the foresight given by God to survive a seven-year famine. This famine reunited Jacob’s family with Joseph’s when Jacob and his family moved from Canaan to Egypt as refugees. After Joseph’s time, a new Pharaoh who didn’t know where the Israelites came from enslaved them because they were foreigners, and this continued for four generations until their Exodus by Moses 144 years after Joseph’s death.
Resources:
Jewish weaning tradition
An article on the pro-Masoretic explanation
Another pro-Masoretic article
Video on the pro-Septuagint argument