Genesis 15:8-16

15:8 But Abram said, “O sovereign Lord, by what can I know that I am to possess it?”

15:9 The Lord said to him, “Take for me a heifer, a goat, and a ram, each three years old, along with a dove and a young pigeon.” 15:10 So Abram took all these for him and then cut them in two and placed each half opposite the other, but he did not cut the birds in half. 15:11 When birds of prey came down on the carcasses, Abram drove them away.

15:12 When the sun went down, Abram fell sound asleep, and great terror overwhelmed him. 15:13 Then the Lord said to Abram, “Know for certain that your descendants will be strangers in a foreign country. They will be enslaved and oppressed for four hundred years. 15:14 But I will execute judgment on the nation that they will serve. Afterward they will come out with many possessions. 15:15 But as for you, you will go to your ancestors in peace and be buried at a good old age. 15:16 In the fourth generation your descendants will return here, for the sin of the Amorites has not yet reached its limit.”