Genesis 15:16

He said to Abram, “Know for sure that your offspring will live as foreigners in a land that is not theirs, and will serve them. They will afflict them four hundred years.

I will also judge that nation, whom they will serve. Afterward they will come out with great wealth;

but you will go to your fathers in peace. You will be buried at a good old age.

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.

In that day the LORD made a covenant with Abram, saying, “I have given this land to your offspring, from the river of Egypt to the great river, the river Euphrates:

the land of the Kenites, the Kenizzites, the Kadmonites,