Exodus 12:42
It is a night of watching to be observed for the Lord for having brought them out of the land of Egypt; this [same] night is for the Lord, to be observed and celebrated by all the Israelites throughout their generations.
Deuteronomy 16:1-6
“Observe the month of Abib and celebrate 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
‘Now this day will be a memorial to you, and you shall keep it as a feast to the Lord; throughout your generations you are to celebrate it as an ordinance forever.
Exodus 13:10
Therefore, you shall keep this ordinance at this time from year to year.