Musnad Ahmad 25:501

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, who said: A man narrated to me, from Abdullah ibn Abi Najih, from Mujahid ibn Jabr, from Ibn Abbas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) offered one hundred camels as a sacrificial offering during the Farewell Pilgrimage. He slaughtered thirty of them with his own hand, then he commanded Ali, and he slaughtered the remainder of them. He said: "Distribute their meat, their coverings, and their skins among the people, and do not give the butcher anything from them. Take for us a piece of meat from every camel, then put it in one pot, so that we may eat from its meat and drink from its broth." And he did so.