Numbers 35:27-34

27 and the avenger of blood find him outside the limits of his city of refuge, and the avenger of blood kill the manslayer, there shall be no blood-guiltiness upon him;
28 for the manslayer should have remained in the city of his refuge until the death of the high-priest; but after the death of the high-priest he may return into the land of his possession.
29 And this shall be unto you a statute of right throughout your generations in all your dwellings.
30 Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.
31 And ye shall take no satisfaction for the life of a murderer, who is guilty of death, but he shall certainly be put to death.
32 And ye shall take no satisfaction for him that hath fled to the city of his refuge, that he should come again to dwell in the land, until the death of the priest.
33 And ye shall not pollute the land wherein ye are; for blood, it polluteth the land; and there can be no atonement made for the land, for the blood that hath been shed therein, but by the blood of him that shed it.
34 And ye shall not defile the land that ye inhabit, in the midst whereof I dwell; for I am Jehovah who dwell in the midst of the children of Israel.

Footnotes 5

The Darby Translation is in the public domain.