Numbers 35:31-33

Modern English Version

³¹ And you will not take a ransom for the life of a murderer who is guilty of death, but he will surely be put to death.

³² You will not take a ransom for him who fled to the city of his refuge, that he should come out again to dwell in the land, until the death of the priest.

³³ So you will not defile the land which you are in, because blood defiles the land, and the land cannot be cleansed of the blood that is shed in it, except by the blood of him that shed it.