Shama-il Tirmidhi Chapter 015, Hadith Number 001 (105).

Hazrat Anas radiyallahu anhu reports that, on the day when Makkah was conquered, the Prophet of Allah sallallahu alaihe wasallam wore a helmet when they entered the city. (The Prophet of Allah sallallahu alaihe wasallam removed the helmet after being satisfied that everything was under control). Someone came to the Prophet of Allah sallallahu alaihe wasallam and said, "O' Messenger of Allah, this Ibn Khatl is holding the cover (black cloth) of the Ka'bah." The Prophet of Allah sallallahu alaihe wasallam replied, "Kill him."

Commentary.
When the Prophet of Allah sallallahu alaihe wasallam entered Makkah Mukarramah as a conqueror, the people of Makkah became frightened. There was no place to live nor a path to walk. The Prophet of Allah sallallahu alaihe wasallam who is well known for being merciful and generous, announced that the person who entered the House of Allah (Ka'bah) was safe, and those who remained in their homes were also safe. The one who laid down his arms was also safe, etc. There were eleven men and six women whose crimes could not be forgiven. These people were not included in the general amnesty. It was announced that there was no mercy for these people. Among these criminals seven men and two women embraced Islam and were pardoned. The remaining four men and four women were killed. Ibn Khatl was one of the eight that were punished.

He had first come to Madinah Munawwarah where he accepted Islam and kept the name Abdullah. The Prophet of Allah sallallahu alaihe wasallam sent him to a tribe to collect zakah. He killed a Muslim slave just because he had not prepared meals on time. Fearing that if he returned to Madinah Munawwarah he would be punished by death, he became a murtad (apostate) and went to Makkah. In Makkah he used to abuse the Prophet of Allah sallallahu alaihe wasallam. He purchased two slave girls, who sang songs in which the Prophet of Allah sallallahu alaihe wasallam was satirized. This made him feel happy. For this reason, despite of entering the Baytullah (Ka'bah), he was killed.

There are many versions according to the Muhadditheen as to who the person was that killed him. A fiqhi mas'alah may also arise from this hadith that punishment and revenge is permissible in the Haram. The question needs a lengthy explanation, and there is no need for it here. It is omitted to keep the subject matter brief. These matters are referred to so that those who love to acquire knowledge and also students after reading it, will seek more information from their Mashaa'ikh. From this we also find a question of entering Makkah Mukarramah without Ihram, which is discussed in the hadith that follows.