Musnad Abu Ya'la al-Mawsili 130:41

'Abd al-A'la narrated to us, 'Uthman ibn 'Umar narrated to us, Shu'bah narrated to us, from 'Abd al-'Aziz ibn Suhayb, who said: I heard Anas ibn Malik say: The Messenger of Allah (may Allah bless him and grant him peace) sacrificed two white-and-black rams. Anas said: So I sacrifice two rams.