Numbers 35:31-33

New Living Translation

³¹ Also, you must never accept a ransom payment for the life of someone judged guilty of murder and subject to execution; murderers must always be put to death. ³² And never accept a ransom payment from someone who has fled to a city of refuge, allowing a slayer to return to his property before the death of the high priest. ³³ This will ensure that the land where you live will not be polluted, for murder pollutes the land. And no sacrifice except the execution of the murderer can purify the land from murder.^[a]