Exodus 12:40

Then God said to Abram, “Know for certain that your seed will be sojourners in a land that is not theirs, and they will be enslaved and mistreated four hundred years.

“So now, come and I will send you to Pharaoh, and so you shall bring My people, the sons of Israel, out of Egypt.”

And what I am saying is this: the Law, which came 430 years later, does not invalidate a covenant previously ratified by God, so as to abolish the promise.

By faith he kept the Passover and the sprinkling of the blood, so that he who destroyed the firstborn would not touch them.