Musnad Ahmad 33:810

'Affan narrated to us, Hammad bin Salamah narrated to us, Abu al-Zubayr informed us, from Jabir bin 'Abdullah, that a man slaughtered a young goat (atud) before the Prophet, peace and blessings of Allah be upon him, had prayed. The Messenger of Allah, peace and blessings of Allah be upon him, said: "It shall not suffice for anyone after you." And he forbade them from slaughtering until they had prayed.