Exodus 12:14 Now this day will be a memorial to you, and you shall celebrate it as a feast to the LORD; throughout your generations you are to celebrate it as a permanent ordinance.

Exodus 12:17 You shall also observe the Feast of Unleavened Bread, for on this very day I brought your hosts out of the land of Egypt; therefore you shall observe this day throughout your generations as a permanent ordinance.

Exodus 13:5 "It shall be when the LORD brings you to the land of the Canaanite, the Hittite, the Amorite, the Hivite and the Jebusite, which He swore to your fathers to give you, a land flowing with milk and honey, that you shall observe this rite in this month.

Exodus 13:10 "Therefore, you shall keep this ordinance at its appointed time from year to year. (NASB ©1995)