Exodus 12:38-42

A mixed multitude also went up with them, along with flocks and herds, a very large number of livestock.

And they baked the dough which they had brought out of Egypt into cakes of unleavened bread. For it had no yeast, since they were driven out of Egypt and could not delay, nor had they prepared any provisions for themselves.

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.