Musnad Ahmad 32:831

Hajjaj narrated to us, Shu'bah narrated to us, from Qatadah; and Yazid ibn Harun said: Shu'bah informed us, from Qatadah; and Aswad—meaning Shadhan—said: Shu'bah narrated to us, he said: Qatadah informed me, he said: I heard Anas ibn Malik say: The Messenger of Allah (ﷺ) said to a man who was driving a sacrificial camel: "Ride it." The man said: "It is a sacrificial camel." He said: "Ride it." The man said: "It is a sacrificial camel." He said: "Ride it, woe to you," in the third instance.