Ibn Ishaq محمد بن إسحاق بن يسار‎ · The Book of Fighting [The Prohibition of Bloodshed]

"The Messenger of Allah said: 'I have been commanded to fight the people until they say La ilaha illallah. If they say it, then their blood and wealth are prohibited for me, except for a right that is due, and their reckoning will be with Allah, the Mighty and Sublime."

"I heard Sufyan Ath-Thawri narrating this Hadith. He said: 'A man came to the Prophet and said: "What if a man comes to me and wants to take my wealth?" He said: "Remind him of Allah." He said: "What if he pays no heed?" He said: "Seek the help of the Muslims around you against him." He said: "What if there are no Muslims around me?" He said: "Seek the help of the ruler against him." He said: "What if…

The Messenger of Allah said: "If two Muslims confront each other with swords and one of them kills the other, then the killer and the slain will both be in Hell." A man said: "O Messenger of Allah, (we understand about) the killer, but what about the one who is killed?" He said: "He wanted to kill his companion."

"The Messenger of Allah said: 'Do not revert to disbelievers after I am gone, striking the necks of one another (killing one another). No man is to be punished for the sins of his father, or the sins of his brother.'"

The Messenger of Allah said: "Do not revert to disbelievers after I am gone." It is Mursal.