Numbers 5:8

5:8 But if the individual has no close relative to whom reparation can be made for the wrong, the reparation for the wrong must be paid to the Lord for the priest, in addition to the ram of atonement by which atonement is made for him.

Numbers 35:12

35:12 And they must stand as your towns of refuge from the avenger in order that the killer may not die until he has stood trial before the community.

Numbers 35:21

35:21 or with enmity he strikes him with his hand and he dies, the one who struck him must surely be put to death, for he is a murderer. The avenger of blood must kill the murderer when he meets him.