Muhammad bin Abi Isma'il محمد بن أبي إسماعيل · The Book of Zakah

"This is the obligation of Sadaqah which the Messenger of Allah enjoined upon the Muslims, as Allah commanded the Messenger of Allah Whoever is asked for it in the manner explained (in the letter of Abu Bakar), let him give it, and whoever is asked for more than that, let him not give it. When there are less than twenty-five camels, for every five camels, one sheep (is to be given). If the number reaches twenty-five, then a Bint Makhad…