Genesis 15:13-15 Amplified Bible, Classic Edition (AMPC)
13 And [God] said to Abram, Know positively that your descendants will be strangers dwelling as temporary residents in a land that is not theirs [Egypt], and they will be slaves there and will be afflicted and oppressed for 400 years. [Fulfilled in Exod. 12:40.]
14 But I will bring judgment on that nation whom they will serve, and afterward they will come out with great possessions.
15 And you shall go to your fathers in peace; you shall be buried at a good old (hoary) age.