It is narrated from Sayyiduna Salamah bin Qays al-Ashja'i (may Allah be pleased with him): Listen! They are four things, about which today I am even more keen than I was on the day I heard them from the Messenger of Allah (peace and blessings be upon him). I heard the Messenger of Allah (peace and blessings be upon him) say during the Farewell Hajj: "Do not associate anything with Allah, do not kill the soul that Allah has made sacred, do not steal, and do not commit adultery." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

It is narrated from Sayyiduna Uqbah bin Amir al-Juhani (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever meets Allah Almighty in the state that he has not associated anyone with Allah, and has not stained his hands by unjustly shedding anyone's blood, may enter Paradise by whichever of its gates he wishes."

It is narrated from Sayyiduna Jarir bin Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever dies in the state that he does not associate anyone with Allah, and has not unjustly shed anyone's blood, may enter Paradise by whichever of its gates he wishes."

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that in the blessed time of the Prophet (peace and blessings be upon him) a man was killed in Madinah. He (peace and blessings be upon him) ascended the pulpit and, delivering a sermon, said three times: "Do you know who killed this slain man in your midst?" The people said: By Allah! We do not know who killed him. So he (peace and blessings be upon him) said: "By the One in whose Hand is my soul! If all the inhabitants of the heavens and all the inhabitants of the earth took part in killing a believer and were pleased with it, Allah would enter them all into Hell. And by the One in whose Hand is my soul! No one will bear hatred toward us, the People of the House (Ahl al-Bayt), except that Allah will throw him face down into the Fire."

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A believer does not kill by treacherous surprise attack (fatk); faith has restrained treacherous killing." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Marwan bin al-Hakam: I went in with Sayyiduna Mu'awiyah (may Allah be pleased with him) to the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), and she said: O Mu'awiyah! You killed Hujr and his companions and did what you did. Do you not fear that I might hide a man in wait who would kill you? He replied: No, I am in a house of safety. I heard the Messenger of Allah (peace and blessings be upon him) say: "Faith has restrained treacherous killing; a believer does not kill treacherously."

It is narrated from Amr bin Ghalib that Sayyiduna Ammar (may Allah be pleased with him) came to Sayyidah Aishah (may Allah be pleased with her) on the day of the Battle of the Camel and said: Peace be upon you, O my mother! She said: I am not your mother. Ammar said: Rather, you are my mother, even if you dislike it. Sayyidah Aishah asked: Whose voice is this that I hear with you? He said: Al-Ashtar's. The Lady said: O Ashtar! Are you the one who wanted to kill my sister's son? Al-Ashtar said: I tried my utmost to kill him and he tried to kill me, but we were not able to. The Lady said: By Allah! Had you killed him, you would never have succeeded. Then she said: O Ammar! You know well that the Messenger of Allah (peace and blessings be upon him) said: "No one is to be killed except one of three: a man who killed someone and is killed in retaliation for him, a married person who commits adultery, and one who turns away from Islam." This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Amir bin Shaddad: I was well acquainted with the secrets of the Liar (al-Kadhdhab). I used to go to him with my sword. One day I went to him and he said: By Allah! You have come to me just as Jibril has risen from this chair. I reached for the hilt of my sword and thought of cutting off his head, but then I remembered the hadith that Sayyiduna Amr bin al-Hamiq (may Allah be pleased with him) narrated to us, saying: I heard the Messenger of Allah (peace and blessings be upon him) say: "When a man trusts another (gives him safety), and then that one kills him, a banner of treachery will be raised for him on the Day of Resurrection." This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "The blood of a person from the people of the Qiblah is not lawful except in three cases: one who killed, so he is killed in retaliation; the married adulterer; and the one who leaves the community (jama'ah)." This hadith has an authentic chain (sahih al-isnad) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it with this wording.

It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that she said: "Shedding the blood of anyone from the people of the Qiblah is not lawful except in three cases: a man who killed someone, so he is killed in retaliation for him; the married adulterer; and the one who separates from the community (jama'ah)."