Acts 7:6

And God spake thus unto him, "that his seed should sojourn in a strange country, and they shall in slave and abuse them four hundred years:"

Galatians 3:17

This then I say, that the law, which was given four hundred and thirty years after, cannot disannul the covenant, which was so long before confirmed by God unto Christ, to make void 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
This then I say, that the law, which was given four hundred and thirty years after, cannot disannul the covenant, which was so long before confirmed by God unto Christ, to make void the promise.