Genesis 15:13; Genesis 15:16; Genesis 15:18

13 God said to Abram, "You can know for sure that your descendants will live in a land that is not their own, where they will be slaves, and they will be oppressed for 400 years.

16 In the fourth generation your descendants will come back here, because the sin of the Amorites will not have run its course until then."

18 At that time the LORD made a promise to Abram. He said, "I will give this land to your descendants. This is the land from the river of Egypt to the great river, the Euphrates.