It is narrated from Sayyiduna Imran bin Husain (may Allah be pleased with him) that some people from the tribe of Banu Jashm, including Ubayis or Ibn Ubayis, came to him, and one of them said to him:“Do you not fight until the turmoil subsides?”He replied:“Perhaps I have fought for this very purpose, that there be no turmoil. Shall I not tell you something that the Messenger of Allah (peace and blessings be upon him) said? And I think perhaps it will not benefit you, but in any case, remain silent.”The Prophet (peace and blessings be upon him) said:“O Banu so-and-so! Fight against Banu so-and-so.”As soon as he said this, the ranks of men were formed, and behind them were their women. Then, when they returned, a man said:“O Messenger of Allah! Seek forgiveness for me, may Allah forgive you as well.”The Prophet (peace and blessings be upon him) asked:“Have you done something new?”He said:“Yes, when the enemy people were being defeated, I found a man between the men and women. He said: ‘I am a Muslim,’ or ‘I have accepted Islam,’ but I killed him. In fact, when he saw the shower of spears, he said this to save himself.”The Prophet (peace and blessings be upon him) said:“Did you cut open his heart to see (the truth)?”He said:“No, by Allah, I did not do that.”Then the Prophet (peace and blessings be upon him) did not seek forgiveness for that man.

In another narration: The Messenger of Allah (peace and blessings be upon him) said:“O Banu so-and-so! You people fight against Banu so-and-so.”One of my relatives also went with them, but when he returned to the Prophet (peace and blessings be upon him), he said:“O Messenger of Allah! Seek forgiveness from Allah for me, may Allah forgive you.”The Prophet (peace and blessings be upon him) asked:“Have you done something new?”He said:“When the enemies were defeated, I found two men between the men and women. They said that they were Muslims or that they had accepted Islam, but I killed them.”The Messenger of Allah (peace and blessings be upon him) said:“I have been commanded to fight people on the basis of Islam alone. By Allah, I will not seek forgiveness for you.”Later, this man died, and his relatives buried him, but when morning came, the earth had thrown him out. They buried him again and kept a watch over him, but the earth threw him out again. They said to the guards:“Perhaps someone came and took him out while you were sleeping.”So they buried him a third time and kept watch, but the earth threw him out again. When they saw this situation, they left him lying outside.

It is narrated from Humaid bin Hilal, he says: A man gathered me and Bishr bin Asim and related this matter from Sayyiduna Uqbah bin Malik (may Allah be pleased with him): The people of one of the expeditions of the Messenger of Allah (peace and blessings be upon him) reached the water-bearers in the morning. When one of them came out, a man from among the Muslims attacked him. He said in response that he was a Muslim, but the Muslim killed him. When these people returned and informed the Messenger of Allah (peace and blessings be upon him) of this, he (peace and blessings be upon him) stood up to address them, praised and glorified Allah, and then said: "As for what follows, what will be the state of that Muslim who kills a man who is saying that he is a Muslim?" That man said: "Yes, he said this to save himself." The Messenger of Allah (peace and blessings be upon him) turned his face away and extended his right hand. In one narration it is mentioned: The Messenger of Allah (peace and blessings be upon him) turned towards him and said: "Can you recognize evil on his face?" Then the Messenger of Allah (peace and blessings be upon him) said: "Whoever kills a Muslim, Allah has denied me concerning him." The Messenger of Allah (peace and blessings be upon him) repeated this sentence three times.

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Khalid bin Walid (may Allah be pleased with him) towards the tribe of Banu Jadhimah. He invited this tribe to Islam, but they could not say in a good manner that they had become Muslims. Instead of saying "We have accepted Islam (Aslamna)," they started saying: "We have turned away, we have turned away (Saba'na, Saba'na)." On the other side, Sayyiduna Khalid (may Allah be pleased with him) began to imprison and kill them, and each one of us was given a prisoner, until when morning came, Sayyiduna Khalid ordered that each man should kill his own prisoner. Sayyiduna Ibn Umar (may Allah be pleased with him) said: By Allah! Neither will I kill my prisoner, nor will any man among my companions kill his prisoner. Then, when they came to the Messenger of Allah (peace and blessings be upon him) and informed him of the action of Sayyiduna Khalid (may Allah be pleased with him), the Messenger of Allah (peace and blessings be upon him) raised both his hands and said: O Allah! I declare myself free before You from what Khalid has done (i.e., I have nothing to do with this action). The Messenger of Allah (peace and blessings be upon him) said this sentence twice.

It is narrated from Ibn Mu’iz Sa’di, he says: I went out at the time of suhoor to give water to my horse. When I passed by the mosque of Banu Hanifa, I heard them saying: Indeed, Musaylimah is the Messenger of Allah. I went to Sayyiduna Abdullah (may Allah be pleased with him) and informed him of this incident. He sent the army, and they brought them back after capturing them. He demanded that they repent, and they repented, so he set them free, but he beheaded Abdullah bin Nuwahah. They said: How is it that you captured a people for one crime, then killed one and released another? I was present with the Messenger of Allah (peace and blessings be upon him), this man and Ibn Athal bin Hajar came to the Messenger of Allah (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said to them: Do you both testify that I am the Messenger of Allah? They said: We testify that indeed Musaylimah is the Messenger of Allah. Upon hearing this, the Noble Prophet (peace and blessings be upon him) said: I believe in Allah and His Messengers. If I were to kill any envoy, I would have killed both of you. He said: It is for this reason that I killed him.

. (Second chain) When Ibn Nuwahah was killed, Sayyiduna Abdullah (may Allah be pleased with him) said: He and Ibn Athal both came to the Noble Prophet (peace and blessings be upon him); both of them were envoys of Musaylimah the Liar. The Messenger of Allah (peace and blessings be upon him) said to them: Do you bear witness that I am the Messenger of Allah? They said: We bear witness that Musaylimah is the Messenger of Allah. The Prophet (peace and blessings be upon him) said: If I were to kill any envoy, I would have beheaded both of you. Thus, by this statement of the Prophet (peace and blessings be upon him), it became established that envoys are not to be killed. As for the matter of Ibn Athal, Allah Almighty has sufficed us regarding him, and this man kept plotting until Allah Almighty gave me power (and I killed him).

It is narrated from Harithah bin Mudarrib, he says: Sayyiduna Abdullah (may Allah be pleased with him) said to Ibn Nawahah: I heard the Messenger of Allah (peace and blessings be upon him) say, "If you were not a messenger, I would have killed you." Today you are not a messenger. Khurshah! Get up and behead him. So he got up and killed him.

Narrated from Sayyiduna Nu'aym bin Mas'ud Ashja'i (may Allah be pleased with him), he says: When the Messenger of Allah (peace and blessings be upon him) read the letter of Musaylimah the Liar, he said to his two messengers: "What do you yourselves say?" They replied: "We say what Musaylimah says." The Prophet (peace and blessings be upon him) said: "By Allah! If it were not that messengers are not killed, I would have beheaded both of you."

It is narrated from Sayyiduna Mughirah bin Shu’bah (may Allah be pleased with him) that he accompanied a group of polytheists, but when he found them heedless, he killed all of them and brought their wealth to the Messenger of Allah (peace and blessings be upon him). However, the Prophet (peace and blessings be upon him) refused to accept that wealth.