Exodus 13:5; Exodus 13:10

5 When the LORD brings you into the land of the Canaanites, Hittites, Amorites, Hivites and Jebusites—the land he swore to your ancestors to give you, a land flowing with milk and honey—you are to observe this ceremony in this month:

10 You must keep this ordinance at the appointed time year after year.