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 23:24

23:24 “You must not bow down to their gods; you must not serve them or do according to their practices. Instead you must completely overthrow them and smash their standing stones to pieces.