From Sahih Bukhari (Hadith 3044):
Narrated Anas bin Malik (ra):Allah's Messenger (ﷺ) entered (Makkah) in the year of the Conquest (of Makkah) wearing a helmet over his head. After he took it off, a man came and said, "Ibn Khatal is clinging to the curtains of the Ka'bah." The Prophet (ﷺ) said, "Kill him
Reference: Bukhari 3044