Genesis 15:12-16

12Now when the sun was going down, a deep sleep fell upon Abram; and behold, horror and great darkness fell upon him.

13Then He said to Abram: “Know certainly that your descendants will be strangers in a land that is not theirs, and will serve them, and they will afflict them four hundred years.

14And also the nation whom they serve I will judge; afterward they shall come out with great possessions.

15Now as for you, you shall go to your fathers in peace; you shall be buried at a good old age.

16But in the fourth generation they shall return here, for the iniquity of the Amorites is not yet complete.”