Numbers 35:31-33

International Standard Version

³¹ You are to receive no ransom for the life^[a] of a killer who is guilty of murder; instead, he is to die. ³² You are not to receive payment of a^[b] ransom for someone who had fled to a town of refuge but then left to live in his homeland before the death of the high priest. ³³ You are not to pollute the land where you live, because blood defiles the land, and the land cannot atone for blood that has been spilled on it, except through the blood of the one who spilled it.