Musnad Abu Ya'la al-Mawsili 116:3

Ahmad narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us, from Qatadah, who said: I heard Anas [say] that the Messenger of Allah (may Allah bless him and grant him peace) came upon a man driving a sacrificial camel. He said: "Woe to you," or "Alas for you, ride it."