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

13 And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years;
16 But in the fourth generation they shall come hither again : for the iniquity of the Amorites is not yet full.
18 In the same day the LORD made a covenant with Abram, saying , Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates: