Numbers 35:31 KJV
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.
Numbers 35:31, King James Version
In context
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.
32 And ye shall take no satisfaction for him that is fled to the city of his refuge, that he should come again to dwell in the land, until the death of the priest.