Acts 7:6

"What God said was this. "'His offspring will sojourn in a foreign land where they will be enslaved and oppressed for four hundred years.

Galatians 3:17

I mean to say that the testament which God has already ratified could not be annulled by the Law which came four hundred and thirty years later, so as to make the Promise void.

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

Four

Galatians 3:17
I mean to say that the testament which God has already ratified could not be annulled by the Law which came four hundred and thirty years later, so as to make the Promise void.