It is about Passover and its traditional foods.

Passover and its Symbolic Foods . The key to Passover is organization. Not only must special food be bought and stored, but the entire house, including garage and cars must be rid of chametz, any leavened food. On the very first day, you shall remove leaven from your houses, for whoever eats leavened bread from the first day to the seventh day, that person shall be cut off from Israel" (Exodus 12:15). Chametz: So what exactly is …

…holiday. To do so is considered stealing belongs of another. One last item. There are many Jews, usually the Orthodox, who do not eat bread owned by a Jewish bakery or store that was open on Passover. In Hebrew this is called, chametz she-avar alav ha-Pesach. If you agree or feel the same way, wait a couple of weeks until you can be reasonably sure that whatever was baked during Passover has already been sold.