Musnad Ahmad 30:3185

I read to Abd al-Rahman: Malik, and Ishaq narrated to us, he said: Malik informed us, from Abu al-Zinad, from al-A’raj, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) saw a man driving a sacrificial camel. He said: "Ride it." The man said: "It is a sacrificial camel." He said: "Ride it, woe to you," in the second or third time. Ishaq said: "Ride it, woe to you; ride it, woe to you."