Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 582

Narrated Anas bin Malik:

On the day of the Conquest, the Prophet entered Mecca, wearing a helmet on his head. When he took it off, a man came and said, "Ibn Khatal is clinging to the curtain of the Ka'ba." The Prophet said, "Kill him." (Malik a sub-narrator said, "On that day the Prophet was not in a state of Ihram as it appeared to us, and Allah knows better.")