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

13 And he said to Abram, Truly, your seed will be living in a land which is not theirs, as servants to a people who will be cruel to them for four hundred years;
16 And in the fourth generation they will come back here; for at present the sin of the Amorite is not full.
18 In that day the Lord made an agreement with Abram, and said, To your seed have I given this land from the river of Egypt to the great river, the river Euphrates:
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