Genesis 15:10-16

He brought all these animals to him, split them down the middle, and laid the halves opposite each other. But he didn’t split the birds. Vultures swooped down on the carcasses, but Abram scared them off. As the sun went down a deep sleep overcame Abram and then a sense of dread, dark and heavy. GOD said to Abram, “Know this: your descendants will live as outsiders in a land not theirs; they’ll be enslaved and beaten down for 400 years. Then I’ll punish their slave masters; your offspring will march out of there loaded with plunder. But not you; you’ll have a long and full life and die a good and peaceful death. Not until the fourth generation will your descendants return here; sin is still a thriving business among the Amorites.”