Ruling 1886 — Alms Tax (Zakat)

If a person buys wheat, barley, dates, or grapes, and he knows that the seller has given zakat on them, or he doubts whether the seller has given zakat on them or not, then zakat is not obligatory for him; but if he knows that the seller has not given zakat on them, he must give it. However, if the seller has cheated him, he can claim the amount of zakat he gave from the seller after giving the zakat.