Anas (RAA) narrated that The Messenger of Allah (ﷺ) entered Makkah with a helmet on his head, and when he took it off, a man came to him and said, 'lbn Khattal is hanging on to the curtains of the Ka'bah.' The Prophet thereupon said, "Kill him." Agreed upon.
English reference: Book 11, Hadith 1322
Arabic reference: Book 11, Hadith 1296