Musnad Abu Ya'la al-Mawsili 115:265

Zuhayr narrated to us, Affan narrated to us, Hammam narrated to us, from Qatadah, from Anas, that the Prophet (peace and blessings of Allah be upon him) came upon a man driving a sacrificial camel. He said, "Ride it." The man said, "It is a sacrificial camel." He said, "Woe to you, ride it."