Joshua 20:6
He is to live in that city until he stands trial before the community, until the death of the one who is high priest at that time. Then the killer may return to his own city and to his own home, that is, to the city from which he fled."
Numbers 35:12
They are to serve as cities of refuge from a blood avenger in order to keep the inadvertent killer from dying until he has stood trial in the presence of the community.
Numbers 35:24-25
then the community is to judge between the inadvertent killer and the blood avenger, following these ordinances.
Hebrews 9:26
Then he would have had to suffer repeatedly since the creation of the world. But now, at the end of the ages, he has appeared once for all to remove sin by his sacrifice.