Genesis 15:11-14
English Standard Version
12As the sun was going down, a deep sleep fell on Abram. And behold, dreadful and great darkness fell upon him.
13Then the Lord said to Abram, "Know for certain that your offspring will be sojourners in a land that is not theirs and will be servants there, and they will be afflicted for four hundred years.
14But I will bring judgment on the nation that they serve, and afterward they shall come out with great possessions.