Genesis 15:16-18

King James Version

¹⁶ But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full.

¹⁷ And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burning lamp that passed between those pieces.

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: