Abu Da'ud أبو داود السجستاني الأزدي · The Book of Fighting [The Prohibition of Bloodshed]

'Amr bin Aws told him that his father Aws said: "The Messenger of Allah 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."

"The Messenger of Allah said: 'Whoever changes his religion, kill him.'"

"That the Prophet to you.' Abu Musa gave him a cushion to sit down, then a man was brought who had been a Jew, then he became a Muslim, then he reverted to Kufr. Mu'adh said: 'I will not sit down until he is killed; this is the decree of Allah and His Messenger,' (saying it) three times. When he was killed, he sat down."

"On the day of the Conquest of Makkah, the Messenger of Allah . He ('Uthman) said: 'O Messenger of Allah! Accept the allegiance of 'Abdullah.' He raised his head and looked at him three times, refusing his allegiance each time, then he accepted his allegiance after three times. Then he turned to his Companions and said: 'Was there not any sensible man among you who would get up when he saw me refusing to give him my hand and kill…

"The Messenger of Allah said: 'Whoever is killed defending his wealth, he is a martyr.'"