Musnad Abu Ya'la al-Mawsili 113:32

Abu Bakr ibn Abi Shaybah narrated to us, Ahmad ibn Ishaq narrated to us, Wuhayb narrated to us, Ayyub narrated to us, from Abu Qilabah, from Anas: That the Prophet, peace and blessings of Allah be upon him, when he arrived in Makkah, commanded them to exit the state of Ihram, except for those who had the sacrificial animal (Hady) with them. He said: And the Messenger of Allah, peace and blessings of Allah be upon him, slaughtered seven camels while they were standing.