Exodus 13:5-7

5And it shall be when the Lord 1brings you to the land of the Canaanite, the Hittite, the Amorite, the Hivite, and the Jebusite, which 2He swore to your fathers to give you, a land flowing with milk and honey, 3that you shall 4perform this rite in this month.

6For 5seven days you shall eat unleavened bread, and on the seventh day there shall be a feast to the Lord.

7Unleavened bread shall be eaten throughout the seven days; and 6nothing with yeast shall 7be seen among you, nor shall any dough with yeast 8be seen among you in all your borders.