Acts 7:6

This is what God promised: 'His descendants will be strangers living in a foreign land, and its people will enslave and oppress them for four hundred years.'

Galatians 3:17

I mean this: The law which was given four hundred and thirty years later could not annul the contract which had already been ratified by God, so as to cancel 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

Four

Galatians 3:17
I mean this: The law which was given four hundred and thirty years later could not annul the contract which had already been ratified by God, so as to cancel the promise.