It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, entered Makkah on the occasion of the conquest of Makkah in such a state that he, peace and blessings be upon him, was wearing an iron helmet. When he took it off, a man came and said, "O Messenger of Allah, peace and blessings be upon him! Ibn Khatal is clinging to the covering of the Ka'bah." So the Messenger of Allah, peace and blessings be upon him, said: "Kill him."
Hadith Referenceالسنن المأثورة / باب الجهاد / 614
Hadith Takhrijصحیح بخاری، اجزاء الصيد، باب دخول الحرم ومكة بغير احرام، رقم: 1846، صحیح مسلم، الحج، باب دخول مكة بغير احرام، رقم: 1357۔