Genesis 15:13; Genesis 15:16; Genesis 15:18

13 Then the said to Abram, “You can be sure that your descendants will be strangers in a foreign land, where they will be oppressed as slaves for 400 years.
16 After four generations your descendants will return here to this land, for the sins of the Amorites do not yet warrant their destruction.”
18 So the made a covenant with Abram that day and said, “I have given this land to your descendants, all the way from the border of Egypt to the great Euphrates River—