Genesis 15:16 in the King James Version
But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full.
Context
15 but you will go to your fathers in peace. You will be buried at a good old age.
16 In the fourth generation they will come here again, for the iniquity of the Amorite is not yet full.”
17 It came to pass that, when the sun went down, and it was dark, behold, a smoking furnace and a flaming torch passed between these pieces.