Exodus 12:14

12:14 This day will become a memorial for you, and you will celebrate it as a festival to the Lord – you will celebrate it perpetually as a lasting ordinance.

Exodus 12:24

12:24 You must observe this event as an ordinance for you and for your children forever.

Exodus 12:43

Participation in the Passover

12:43 The Lord said to Moses and Aaron, “This is the ordinance of the Passover. No foreigner may share in eating it.