Numbers 35:29-31

King James Version

²⁹ So these things shall be for a statute of judgment unto you throughout your generations in all your dwellings.

³⁰ Whoso killeth any person, the murderer shall be put to death by the mouth of witnesses: but one witness shall not testify against any person to cause him to die.

³¹ Moreover ye shall take no satisfaction for the life of a murderer, which is guilty of death: but he shall be surely put to death.