Genesis 15:11-15

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.

As for you, you shall go to your fathers in peace; you will be buried at a good old age.