Exodus 13:5-7

New Catholic Bible

⁵ When the Lord brings you to the land of the Canaanites, the Hittites, the Amorites, the Hivites, and the Jebusites, that he swore to your fathers to give you, a land flowing with milk and honey, you shall celebrate this rite in this month.

⁶ “For seven days you shall eat unleavened bread, and on the seventh you shall celebrate a feast in honor of the Lord. ⁷ For seven days you shall eat unleavened bread, and there shall be nothing leavened with you. There shall be no leaven in all of your territory.