Numbers 35:29

26 But if the manslayer shall at any time go beyond the border of his city of refuge, where he flees,

27 and the avenger of blood find him outside of the border of his city of refuge, and the avenger of blood kill the manslayer; he shall not be guilty of blood,

28 because he should have remained in his city of refuge until the death of the high priest: but after the death of the high priest the manslayer shall return into the land of his possession.

29 These things shall be for a statute [and] ordinance to you throughout your generations in all your dwellings.

30 Whoever kills any person, the murderer shall be slain at the mouth of witnesses: but one witness shall not testify against any person that he die.

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

32 You shall take no ransom for him who is fled to his city of refuge, that he may come again to dwell in the land, until the death of the priest.