Musnad Abu Ya'la al-Mawsili 119:5

Abu Sa’id al-Ashajj narrated to us, Abu Khalid narrated to us, from Ibn Jurayj, from ‘Abd al-Karim ibn Malik, from ‘Ikrimah, from Anas, from the Prophet (peace be upon him), that he 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: "Even so." The man said: "It is a sacrificial camel." He said: "Ride it, [provided it is] not injured."