Numbers 35:31-33

Amplified Bible, Classic Edition

³¹ Moreover, you shall take no ransom for the life of a murderer guilty of death; but he shall surely be put to death.

³² And you shall accept no ransom for him who has fled to his city of refuge, so that he may return to dwell in the land before the death of the high priest.

³³ So you shall not pollute the land in which you live; for blood pollutes the land, and no atonement can be made for the land for the blood shed in it, but by the blood of him who shed it.