Genesis 15:10-14

Then he brought all these to Him and cut them in two, and laid each half opposite the other; but he did not cut the birds.

And birds of prey came down upon the carcasses, and Abram drove them away.

Now when the sun was going down, a deep sleep fell upon Abram; and behold, terror and great darkness fell upon him.

Then God said to Abram, “Know for certain that your descendants will be strangers in a land that is not theirs, where they will be enslaved and oppressed for four hundred years.

But I will also judge the nation whom they will serve, and afterward they will come out with many possessions.