Malik Muwatta: Hadith 647

Maliksaid, "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."