(For that) because Cain wrongfully killed Abel (cause We decreed for the Children of Israel) in the Torah (that whosoever killeth a human being for other than man slaughter) i.e. premeditatedly (or corruption in the earth) or because of idolatry, (it shall be as if be had killed all mankind) Hell will be decreed for him for premeditatedly and wrongfully killing a human being, as though he killed all mankind, (and whoso saveth the life of one) whoever abstains from killing a person, (it shall be as if he had saved the life of all mankind) Paradise will be decreed for him for sparing one soul, as though he spared the lives of all mankind. (Our messengers came unto them) i.e. the Children of Israel (of old with clear proofs) with commands, prohibitions and signs, (but afterwards lo! many of them) the Children of Israel (became) after the messengers (prodigals in the earth) ascribing partners to Allah.