Genesis 15:9-13

9He said to him, “Bring me a three-year-old cow, a three-year-old female goat, a three-year-old ram, a turtledove, and a young pigeon.”

10So he brought all these to him, cut them in half, and laid the pieces opposite each other, but he did not cut the birds in half.

11Birds of prey came down on the carcasses, but Abram drove them away.

12As the sun was setting, a deep sleep came over Abram, and suddenly great terror and darkness descended on him.

13Then the Lord said to Abram, “Know this for certain: Your offspring will be resident aliens for four hundred years in a land that does not belong to them and will be enslaved and oppressed.