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Promises from God to Abraham: Genesis 15–17

God was promising Abraham the world, or at least a large chunk of the known world currently occupied by the Amorites. But he wouldn’t get it just yet:

Genesis 15:13–16You can be sure that your descendants will be strangers in a foreign land, where they will be oppressed as slaves for 400 years. … After four generations your descendants will return here to this land, for the sins of the Amorites do not yet warrant their destruction.

He would have to wait some 400 years.

(The word ‘generation’ could just as easily have been transcribed as ‘age’, ‘era’, or ‘time’; so there’s no point in arguing over who was where and when.)

There’s some discussion about when the 400 years started: was it with the birth of Isaac, or the promise of the birth of Isaac, or while Abraham himself was in Egypt, or when Ishmael started bullying the five-year old Isaac, or of when Joseph brought his family across to Egypt?

Paul (Galatians 3:17) and Moses (Exodus 12:40) both report a sojourning time of 430 years for the sons or children of Israel. Sojourning could mean anything, and there is an argument that Israel as a nation started with Abraham, when God promised him the earth, or at least part of it, and that he would be the father of the nation to eventually populate it. That promise is a neat 430 years before the Exodus.

You can also see a neat four generations of the main players. The 64-year gap is covered, briefly, in just a few verses in Exodus 6.

Generation Elapsed time What happened
Abraham 0 God makes his first promise to Abraham (Gen 12:1-4)
Abraham
Isaac
25 Isaac is born (Gen 21:5)
30 Ishmael starts bullying Isaac (Gen 21:8-9)
Abraham
Isaac
Jacob
85 Esau and Jacob are born (Gen 25:7)
100 Abraham dies (Gen 25:7)
Isaac
Jacob
Joseph
176 Joseph is born
193 Joseph is sold into slavery in Egypt (Gen 37)
205 Isaac dies (Gen 35: 28–29)
Jacob
Joseph
215 Joseph brings his family, including his father Israel, to Egypt (Gen 45:4–6, Gen 49)
232 Jacob dies (Gen 47–49)
Joseph 286 Joseph dies (Gen 50:26)
A gap This 64-year gap could well have been the time of severe oppression in Egypt.
(Exodus 6:16–20)
Moses 350 Moses is born (Ex 6: 16–20)
430 The 80-year old Moses and his brother Aaron ask Pharoah to let God’s people go. They leave shortly afterwards. (Ex 7:7, 12 and Gal 3:16-17)

More reading:

How Many Years Were the Israelites in Egypt?
How Long Were the Israelites in Egypt? (this article also does the arithmetic for 430 years)
The Duration of the Israelite Sojourn In Egypt

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