Acts 7:6

And this is, in effect, what God spoke [to him]: That his descendants would be aliens (strangers) in a foreign land, and that they would be enslaved and mistreated for four hundred years.

Genesis 15:13

God said to Abram, “Know for sure that your descendants will be strangers [living temporarily] in a land (Egypt) that is not theirs, where they will be enslaved and oppressed for four hundred years.

Genesis 15:16

Then in the fourth generation your descendants shall return here [to Canaan, the land of promise], for the wickedness and guilt of the Amorites is not yet complete (finished).”

Exodus 12:40-41

Now the period of time the children of Israel lived in Egypt was four hundred and thirty years.

Galatians 3:17

This is what I mean: the Law, which came into existence four hundred and thirty years later [after the covenant concerning the coming Messiah], does not and cannot invalidate the covenant previously established by God, so as to abolish the promise.

Treasury of Scripture Knowledge

Summary

And God spake on this wise, That his seed should sojourn in a strange land; and that they should bring them into bondage, and entreat them evil four hundred years.

Bible References

That

Genesis 15:13
God said to Abram, “Know for sure that your descendants will be strangers [living temporarily] in a land (Egypt) that is not theirs, where they will be enslaved and oppressed for four hundred years.

Four

Exodus 12:40
Now the period of time the children of Israel lived in Egypt was four hundred and thirty years.
Galatians 3:17
This is what I mean: the Law, which came into existence four hundred and thirty years later [after the covenant concerning the coming Messiah], does not and cannot invalidate the covenant previously established by God, so as to abolish the promise.