Musnad Ahmad 32:1469

Ishaq ibn Isa narrated to us, he said: I heard Malik narrating from al-Zuhri, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) entered Makkah on the day of the Conquest, and upon his head was a helmet. When he removed it, a man came to him and said: "Ibn Khatal is clinging to the curtains of the Kaaba." He said: "Kill him."