Acts 7:6

God declar'd likewise, "that his posterity should sojourn in a strange land, where they should be enslaved and abused four hundred years.

Galatians 3:17

this therefore I say, that the law, which was not till four hundred and thirty years after, cannot disannul the promise, that was ratified before by God, so as to set the promise afoot.

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 therefore I say, that the law, which was not till four hundred and thirty years after, cannot disannul the promise, that was ratified before by God, so as to set the promise afoot.