Genesis 15:13-16

Then the LORD said to Abram, “Know this for certain: Your offspring will be resident aliens for four hundred years in a land that does not belong to them and will be enslaved and oppressed. However, I will judge the nation they serve, and afterward they will go out with many possessions. But you will go to your ancestors in peace and be buried at a good old age. In the fourth generation they will return here, for the iniquity of the Amorites has not yet reached its full measure.”