Acts 7:6

And God declared that Abraham's posterity should for four hundred years make their home in a country not their own, and be reduced to slavery and be oppressed.

Galatians 3:17

I mean that the Covenant which God had already formally made is not abrogated by the Law which was given four hundred and thirty years later--so as to annul 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 that the Covenant which God had already formally made is not abrogated by the Law which was given four hundred and thirty years later--so as to annul the promise.