Musnad Abu Ya'la al-Mawsili 3:199

Abu Bakr ibn Abi Shaybah narrated to us, Sharik narrated to us, from Abu al-Hasna’, from al-Hakam, from Hanash, from Ali, who said: The Messenger of Allah (may Allah bless him and grant him peace) commanded me to sacrifice two rams on his behalf, so I love to do it.