Exodus 12:17

12:17 So you will keep the Feast of Unleavened Bread, because on this very day I brought your regiments out from the land of Egypt, and so you must keep this day 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.