It is a night to be much observed unto the LORD for bringing them out from the land of Egypt: this is that night of the LORD to be observed of all the children of Israel in their generations.
Deuteronomy 5:15And remember that thou wast a servant in the land of Egypt, and that the LORD thy God brought thee out thence through a mighty hand and by a stretched out arm: therefore the LORD thy God commanded thee to keep the sabbath day.
Deuteronomy 6:12Then beware lest thou forget the LORD, which brought thee forth out of the land of Egypt, from the house of bondage.