Concise Quran Commentary
Due to Cain’s murder of his brother, I informed the Israelites that any person who kills another person for no valid reason – such as legal retribution or as punishment for causing corruption in the land by treason or waging war – it is as if he has killed all people, since he did not make a distinction between an innocent and a guilty person. Whoever refrains from killing a person whose soul I have made sacred, and regards it to be forbidden to kill such a person, it is as if he has given life to all people, because in such an action lies the safety of all people. My messengers brought to the Israelites clear signs and evidences. Despite this many of them overstepped My limits by committing sins and going against the messengers.