Narrated to us Abu Bakr ibn Abi Shaybah and Muhammad ibn Abdullah ibn Numayr — and the wording is that of Ibn Abi Shaybah — both said: Narrated to us Abu Mu'awiyah, from al-A'mash, from Abdullah ibn Murrah, from Masruq, from Abdullah, who said: The Messenger of Allah, peace and blessings be upon him, said: "No soul is killed unjustly, but a share of its blood is upon the first son of Adam, because he was the first to establish the practice of killing."