Hammad bin Zayd حماد بن زيد بن درهم الأزدي الأزرق · The Book of Fighting [The Prohibition of Bloodshed]

The Messenger of Allah said: "Whoever comes worshipping Allah and not associating anything with Him, establishing Salah, paying Zakah and avoiding major sins, Paradise will be his." They asked him about major sins and he said: "Associating others with Allah, killing a Muslim soul, and fleeing (from the battlefield) on the day of the march."

A group of eighty people from 'Ukl came to the Prophet , so he sent (men after them) and they caught them and brought them back. He had their hands and feet cut off and branded their eyes, and left them in the sun to die.

"Fighting a believer is Kufr and defaming him is evildoing."