Genesis 15:12-17

12 And when the sun was going down, a deep sleep fell on Abram; and, see, an horror of great darkness fell on him.

13 And he said to Abram, Know of a surety that your seed shall be a stranger in a land that is not their's, and shall serve them; and they shall afflict them four hundred years;

14 And also that nation, whom they shall serve, will I judge: and afterward shall they come out with great substance.

15 And you shall go to your fathers in peace; you shall be buried in a good old age.

16 But in the fourth generation they shall come here 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.