Exodus 12:40-42

40Now the sojourn of the children of Israel who lived in Egypt was four hundred and thirty years.

41And it came to pass at the end of the four hundred and thirty years—on that very same day—it came to pass that all the armies of the Lord went out from the land of Egypt.

42It is a night of solemn observance to the Lord for bringing them out of the land of Egypt. This is that night of the Lord, a solemn observance for all the children of Israel throughout their generations.