Acts 7:6

And God said thus; that his posterity should be a stranger in a foreign land, and they shall enslave it and treat it injuriously four hundred years;

Galatians 3:17

And this I say; that the law which was four hundred and thirty years after, cannot abrogate the covenant previously established by God, to make the promise of no effect.

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
And this I say; that the law which was four hundred and thirty years after, cannot abrogate the covenant previously established by God, to make the promise of no effect.