Exodus 12:40-44

Now the time that the sons of Israel had lived in Egypt was 430 years.

And at the end of 430 years, on this very day, all the multitudes of the Lord departed from the land of Egypt. Ordinance of the Passover

It is a night to be observed for the Lord, for having brought them out of the land of Egypt; this night is for the Lord, to be observed by all the sons of Israel throughout their generations.

And the Lord said to Moses and Aaron, “This is the ordinance of the Passover: no foreigner is to eat it;

but as for every slave that someone has purchased with money, after you have circumcised him, then he may eat it.