Numbers 35:29-31

Darby Translation

²⁹ And this shall be unto you a statute of right throughout your generations in all your dwellings.

³⁰ Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.

³¹ And ye shall take no satisfaction for the life of a murderer, who is guilty of death, but he shall certainly be put to death.