It is related from Hazrat Anas radiyallahu anhu that the Prophet of Allah sallallahu alaihe wasallam, when entering Makkah as a conqueror, wore a helmet on his auspicious head. After he had removed it, a person came and said, "O' Messenger of Allah, Ibn Khatl is clinging to the cover of the Ka'bah."The Prophet of Allah sallallahu alaihe wasallam replied, "He is not of the ones who have been granted amnesty, kill him."Ibn Shihaab Zuhri says, "I have been informed that the Prophet of Allah sallallahu alaihe wasallam was not in the state of Ihraam.
English reference: Book 15, Hadith 106
Arabic reference: Book 16, Hadith 113