Genesis 15:12-16

The sun began to go down and Abram got very sleepy. While he was asleep, a very terrible darkness came over him. Then the Lord said to Abram, “You should know this: Your descendants will live in a country that is not their own. They will be strangers there. The people there will make them slaves and be cruel to them for 400 years. But then I will punish the nation that made them slaves. Your people will leave that land, and they will take many good things with them. “You yourself will live to be very old. You will die in peace and will be buried with your family. After four generations your people will come to this land again and defeat the Amorites. That will happen in the future because the Amorites are not yet guilty enough to lose their land.”