Bayhaqi 7291 — How the zakah of cattle was made obligatory

Amr bin Dinar narrates from Tawus (may Allah have mercy on him) that the waqs of cattle (the number between two zakah thresholds) was brought to Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him), and he said: "The Messenger of Allah (peace and blessings be upon him) did not command me anything concerning it." Imam al-Shafi'i (may Allah have mercy on him) said: Al-waqs is what does not reach the obligatory amount.
Al-Hasan bin Umarah said that the report which al-Hakam narrated from Tawus from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) is not a proof, in which he said: When the Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Mu'adh (may Allah be pleased with him) to the people of Yemen, he was asked: "What have you been commanded?" He said: "I have been commanded to take a female or male yearling calf from thirty cattle, and a musinnah from every forty."