Exodus 12:40-42 - "Now the time that the sons of Israel lived in Egypt was four hundred and thirty years. And at the end of four hundred and thirty years, to the very day, all the hosts of the LORD went out from the land of Egypt. It is a night to be observed for the LORD for having brought them out from the land of Egypt; this night is for the LORD, to be observed by all the sons of Israel throughout their generations."