Musnad Ahmad 32:738

'Abd al-Razzaq narrated to us, Malik narrated to us, from Ibn Shihab, who said: Anas ibn Malik informed me, saying: The Messenger of Allah (peace and blessings of Allah be upon him) entered Makkah on the day of the Conquest, and he was wearing a helmet. A man came and said: "This is Ibn Khatal, clinging to the curtains [of the Ka'bah]." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Kill him."