Exodus 12:42
It was a night of watching by the LORD, to bring them out of the land of Egypt; so this same night is a night of watching kept to the LORD by all the people of Israel throughout their generations.
Deuteronomy 16:1-6
"Observe the month of Abib and keep the Passover to the LORD your God, for in the month of Abib the LORD your God brought you out of Egypt by night.
Exodus 12:14
"This day shall be for you a memorial day, and you shall keep it as a feast to the LORD; throughout your generations, as a statute forever, you shall keep it as a feast.
Exodus 13:10
You shall therefore keep this statute at its appointed time from year to year.