Genesis 15
15 Ref As for you, you will go to your fathers in peace; at the end of a long life you will be put in your last resting-place.
16 Ref And in the fourth generation they will come back here; for at present the sin of the Amorite is not full.
17 Ref Then when the sun went down and it was dark, he saw a smoking fire and a flaming light which went between the parts of the bodies.
18 Ref 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: