´It was narrated from 'Abdullah that:` The Prophet [SAW] said: "No person is killed wrongfully, but a share of responsibility for his blood will be upon the first son of Adam, because he was the first one to set the precedence, of killing."
Hadith ReferenceSunan an-Nasa'i / The Book Of Fighting (The Prohibition Of Bloodshed) / Hadith: 3990
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه