Numbers 35:31 in the King James Version
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.
Context
30 “‘Whoever kills any person, the murderer shall be slain based on the testimony of witnesses; but one witness shall not testify alone against any person so that he dies.
31 “‘Moreover you shall take no ransom for the life of a murderer who is guilty of death. He shall surely be put to death.
32 “‘You shall take no ransom for him who has fled to his city of refuge, that he may come again to dwell in the land before the death of the priest.