Exodus 12:41

³⁹And they baked the dough which they brought out of Egypt, unleavened cakes, for it had not been leavened; for the Egyptians cast them out, and they could not remain, neither did they prepare provision for themselves for the journey.

⁴⁰And the sojourning of the children of Israel, while they sojourned in the land of Egypt and the land of Canaan, was four hundred and thirty years.

— Exodus 12:41 —

⁴²It is a watch kept to the Lord, so that he should bring them out of the land of Egypt; that very night is a watch kept to the Lord, so that it should be to all the children of Israel to their generations.

⁴³And the Lord said to Moses and Aaron, This is the law of the Passover: no stranger shall eat of it.