It was narrated that 'Abdullah said: "Fighting a believer is Kufr and defaming him is evildoing."

It was narrated that Abu Hurairah said: "The Messenger of Allah (ﷺ) said: 'Whoever parts from obedience, and splits away from the Jama'ah and dies, then he has died a death of Jahiliyyah. Whoever rebels against my Ummah, killing good and evil people alike, and does not try to avoid killing the believers, and does not pay attention to those who are under a covenant, then he is not of me. Whoever fights for a cause that is not clear, advocating tribalism, getting angry for the sake of tribalism, and he is killed, then he has died a death of Jahiliyyah.'"

It was narrated that Jundab bin 'Abdullah said: "The Messenger of Allah (ﷺ) said: 'Whoever fights for a cause that is not clear, advocating tribalism, getting angry for the sake of tribalism, then he has died a death of Jahiliyyah.'"

It was narrated that Abu Bakrah said: "The Messenger of Allah (ﷺ) said: 'If a Muslim points a weapon at his fellow Muslim, then they are on the brink of Hell, and if he kills him, then they will both fall into it.'"

It was narrated that Abu Bakrah said: "If two Muslim men bear weapons against each other, then they are both on the brink of Hell. And if one of them kills the other, they will both be in Hell."

It was narrated from Abu Musa Al-Ash'ari that: The Prophet (ﷺ) said: "If two Muslims confront each other with swords and one of them kills the other, they will both be in Hell."

It was narrated that Abu Bakrah said: "The Messenger of Allah (ﷺ) said: 'If two Muslims fight with swords, and one of them kills the other, then the killer and the slain will both be in Hell.'"

It was narrated from Masruq that: The Messenger of Allah (ﷺ) said: "Do not revert to disbelievers after I am gone." It is Mursal.

It was narrated from Anas bin Malik that: The Prophet (ﷺ) said: "I have been commanded to fight the idolators until they bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that Muhammad is His slave and Messenger. If they bear witness to La ilaha illallah and that Muhammad is His slave and Messenger, and they pray as we pray and face our Qiblah, and eat our slaughtered animals, then their blood and wealth becomes forbidden to us except for a right that is due."

It was narrated from Anas bin Malik that : The Messenger of Allah (ﷺ) said: "I have been commanded to fight the idolators until they bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that Muhammad is the Messenger of Allah (ﷺ) . If they bear witness to La ilaha illallah and that Muhammad is the Messenger of Allah (ﷺ) , and they face our Qiblah, eat our slaughtered animals, and pray as we do, then their blood and wealth become forbidden except for a right that is due, and they will have the same rights and obligations as the Muslims."

Maimun bin Siyah asked Anas bin Malik: "O Abu Hamzah, what makes the blood and wealth of a Muslim forbidden?" He said: "Whoever bears witness to La ilaha illallah (there is none worthy of worship except Allah) and that Muhammad is the Messenger of Allah (ﷺ) , faces our Qiblah, prays as we pray, and eats our slaughtered animals, he is a Muslim, and has the same rights and obligations as the Muslims."

It was narrated that Anas bin Malik said: "When the Messenger of Allah (ﷺ) died, the 'Arabs apostatized, so 'Umar said: 'O Abu Bakr, how can you fight the 'Arabs?' Abu Bakr said: 'The Messenger of Allah (ﷺ) said: "I have been commanded to fight the people until they bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah, and they establish Salah and pay Zakah." By Allah, if they withhold from me a young goat that they used to give to the Messenger of Allah (ﷺ) , I will fight them for it.' 'Umar said: 'By Allah, as soon as I realized how certain Abu Bakr was, I knew that it was the truth.'"

It was narrated that Abu Hurairah said: "When the Messenger of Allah (ﷺ) died and Abu Bakr became the Khalifah after him, and some of the 'Arabs reverted to Kufr, 'Umar said to Abu Bakr: 'How can you fight the people when the Messenger of Allah (ﷺ) said: I have been commanded to fight the people until they say La ilaha illallah (there is none worthy of worship but Allah). Whoever says La ilaha illallah, his wealth and his life are safe from me except for a right that is due, and his reckoning will be with Allah.?' Abu Bakr said: 'By Allah, I will fight whoever separates Salah and Zakah, for Zakah is the compulsory right to be taken from wealth. By Allah, if they withhold from me a rope that they used to give to the Messenger of Allah (ﷺ) , I will fight them for withholding it.' 'Umar, may Allah be pleased with him, said: 'By Allah, as soon as I realized that Allah has expanded the chest of Abu Bakr for fighting, I knew that it was the truth.'"

Abu Hurairah narrated that : The Messenger of Allah (ﷺ) said: "I have been commanded to fight the people until they say La ilaha illallah (there is none worthy of worship but Allah). Whoever says La ilaha illallah, his wealth and his life are safe from me except for a right that is due, and his reckoning will be with Allah."

It was narrated that Abu Hurairah said: "When the Messenger of Allah (ﷺ) died, and Abu Bakr (became Khalifah) after him, and the 'Arabs reverted to Kufr, 'Umar said: 'O Abu Bakr, how can you fight the people when the Messenger of Allah (ﷺ) said: I have been commanded to fight the people until they say La ilaha illallah, and whoever says La ilaha illallah, his wealth and his life are safe from me, except for a right that is due, and his reckoning will be with Allah, the Mighty and Sublime?' Abu Bakr said: 'I will fight whoever separates Salah and Zakah, for Zakah is the compulsory right to be taken from wealth. By Allah, if they withhold from me a young goat that they used to give to the Messenger of Allah (ﷺ) , I will fight them for withholding it.' 'Umar said: 'By Allah, as soon as I saw that Allah has expanded the chest of Abu Bakr to fighting, I knew that it was the truth.'"

It was narrated that An-Nu'man bin Bashir said: "We were with the Messenger of Allah (ﷺ) and a man came and whispered to him. He said: 'Kill him.' Then he said: 'Does he bear witness to La ilaha illallah (there is none worthy of worship except Allah)?' He said: 'Yes, but he is only saying it to protect himself.' The Messenger of Allah (ﷺ) said: 'Do not kill him, for I have been commanded to fight the people until they say La ilaha illallah, and if they say it, their blood and their wealth are safe from me, except for a right that is due, and their reckoning will be with Allah.'"

It was narrated that An-Nu'man bin Salim said: "I heard Aws say: 'I came to the Messenger of Allah (ﷺ) among the delegation of Thaqif and I was with him in a tent. Everyone in the tent had gone to sleep except him and I. A man came and whispered to him, and he said: Go and kill him. Then he said: Does he not bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah? He said: He does bear witness to that. The Messenger of Allah (ﷺ) said: Leave him alone. Then he said: I have been commanded to fight the people until they say La ilaha illallah. If they say it, then their blood and their wealth become forbidden to me, except for a right that is due. (One of the narrators) Muhammad said: I said to Shu'bah: 'Doesn't the Hadith contain: Does he not testify to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah?' He said: 'I think it is both, but I do not know.'"

It was narrated from An-Nu'man bin Salim that: 'Amr bin Aws told him that his father Aws said: "The Messenger of Allah (ﷺ) said: 'I have been commanded to fight the people until they bear witness to La ilaha illallah (there is none worthy of worship except Allah), then their blood and their wealth become forbidden to me, except for a right that is due."

It was narrated from 'Abdullah bin Mas'ud that: The Prophet (ﷺ) said: "A man will come, holding another man's hand, and will say: 'O Lord, this man killed me.' Allah will say to him: 'Why did you kill him?' He will say: 'I killed him so that the glory would be to you.' He will say: 'It is to Me.' Then (another) man will come holding another man's hand, and will say: 'This man killed me.' Allah will say to him: 'Why did you kill him?' He will say: 'So that the glory would be to so and so.' He will say: 'It is not to so and so,' and the burden of sin will be upon him."

It was narrated from Salim bin Abi Ja'd that: Ibn 'Abbas was asked about someone who killed a believer deliberately, then he repented, believed and did righteous deeds, and followed true guidance. Ibn 'Abbas said: "There is no way the repentance could avail him! I heard the Prophet (ﷺ) say: 'He (the victim) will come hanging onto his killer, with his jugular veins flowing with blood and saying: O Lord, ask him why he killed me. Then he said: By Allah, Allah revealed it and never abrogated anything of it.'"