Al-Maaida 5:32

For this reason, We ordained for the Children of Israel that whoever kills a person – unless in retribution for murder or corruption in the land – it is as if he killed all mankind[28]; and whoever saves a life, it is as if he saved the life of all mankind. Our messengers came to them with clear signs, yet many of them continued to exceed the limits[29] afterward in the land.

[28] The Prophet (ﷺ) said: "The biggest of sins are: (1) To associate partners with Allah, (2) to murder a human being, (3) to be undutiful to one’s parents (4) and to give a false testimony" [Sahih al-Bukhāri: 10]
[29] By unreservedly committing grave vile deeds.

Because of that, We decreed upon the Children of Israel that whoever kills a soul unless for a soul[258] or for corruption [done] in the land[259] - it is as if he had slain mankind entirely. And whoever saves one[260] - it is as if he had saved mankind entirely. And Our messengers had certainly come to them with clear proofs. Then indeed many of them, [even] after that, throughout the land, were transgressors.[261]

[258] i.e., in legal retribution for murder.
[259] i.e., that requiring the death penalty.
[260] Or refrains from killing.
[261] Heedless of Allāh's limits, negligent of their responsibilities.

32. Because of that We ordained for the Children of Israel that if anyone killed a person not in retaliation of murder, or (and) to spread mischief in the land - it would be as if he killed all mankind, and if anyone saved a life, it would be as if he saved the life of all mankind. And indeed, there came to them Our Messengers with clear proofs, evidence, and signs, even then after that many of them continued to exceed the limits (e.g. by doing oppression unjustly and exceeding beyond the limits set by Allâh by committing the major sins) in the land![10]

[10] (V.5:32) Narrated Anas bin Mâlik رضي الله عنه: The Prophet صلى الله عليه وسلم said, "The biggest of Al-Kabâ’ir (the great sins) are: (1) To join others as partners in worship with Allâh, (2) to murder a human being, (3) to be undutiful to one’s parents (4) and to make a false statement," or said, "to give a false witness." (Sahih Al-Bukhâri, Vol.9, Hadîth No.10).

For that cause We decreed for the Children of Israel that whosoever killeth a human being for other than manslaughter or corruption in the earth, it shall be as if he had killed all mankind, and whoso saveth the life of one, it shall be as if he had saved the life of all mankind. Our messengers came unto them of old with clear proofs (of Allah's Sovereignty), but afterwards lo! many of them became prodigals in the earth.