Genesis 15:13 in the World English Bible
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.
Context
12 And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.
13 And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, 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.