Musnad Ahmad 30:336

Rabi' narrated to us, Abd al-Rahman narrated to us, Abu al-Zinad narrated to us, from al-A'raj, from Abu Hurairah, that the Messenger of Allah (peace and blessings of Allah be upon him) saw a man driving a sacrificial camel. He said: "Ride it, woe to you." He said: "It is a sacrificial camel." He said: "Ride it, woe to you."