Hameed bin Hilal حميد بن هلال · The Book of Fighting [The Prohibition of Bloodshed]

"Any slave who runs away from his masters and joins the enemy, he has made it permissible to shed his blood."

"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…