Musnad Abu Ya'la al-Mawsili 113:16

Suwayd ibn Sa'id narrated to us, 'Abd al-Wahhab narrated to us, from Ayyub, from Abu Qilabah, from Anas: That the Prophet, may Allah bless him and grant him peace, turned toward two horned, black-and-white rams and slaughtered them with his own hand.