Genesis 15:15-17

Young's Literal Translation

¹⁵ and thou -- thou comest in unto thy fathers in peace; thou art buried in a good old age;

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.