Musannaf Ibn Abi Shayba 35:283

Waki’ narrated to us, from Sufyan, from Abu al-Zinad, from al-A’raj, from Abu Hurayrah, that the Prophet (peace and blessings of Allah be upon him) saw a man driving a sacrificial camel (badana). He said, "Ride it." The man said, "It is a sacrificial camel." He said, "Ride it, even if it is a sacrificial camel."