Muwatta' Malik 17-60

Translation

Malik said, "Payment of all types of kaffara, of zakat al-fitr and of the zakat on grains for which a tenth or a twentieth is due, is made using the smaller mudd, which is the mudd of the Prophet ﷺ except in the case of dhihar divorce, when the kaffara is paid using the mudd of Hisham, which is the larger mudd."

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