Musnad Ahmad 30:1666

Al-Khuza'i narrated to us, he said: Layth ibn Sa'd informed us, from Yazid ibn al-Had, from Ibn Shihab, from Sa'id ibn al-Musayyib, from Abu Hurayrah, he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "I saw 'Amr ibn 'Amir dragging his intestines in the Fire, and he was the first to set free the *sa'ibah* (a she-camel set free for idols) and to slit the ear of the *bahirah* (a she-camel whose ear was slit for idols)."