Exodus 13:7

13:7 Bread made without yeast must be eaten for seven days; no bread made with yeast shall be seen among you, and you must have no yeast among you within any of your borders.

Exodus 23:31

23:31 I will set your boundaries from the Red Sea to the sea of the Philistines, and from the desert to the River, for I will deliver the inhabitants of the land into your hand, and you will drive them out before you.