Genesis 15:16-18

Young's Literal Translation

¹⁶ and the fourth generation doth turn back hither, for the iniquity of the Amorite is not yet complete.'

¹⁷ And it cometh to pass -- the sun hath gone in, and thick darkness hath been -- and lo, a furnace of smoke, and a lamp of fire, which hath passed over between those pieces.

¹⁸ In that day hath Jehovah made with Abram a covenant, saying, `To thy seed I have given this land, from the river of Egypt unto the great river, the river Phrat,