Joshua 20:6

These [were] the cities selected for the sons of Israel, and for the stranger dwelling among them, that every one who smites a soul unintentionally should flee there, that he should not die by the hand of the avenger of blood, until he should stand before the congregation for judgment.

And he shall dwell in that city, until he stand before the congregation for judgment, and until the death of the high priest that shall be in those days: then shall the slayer return, and come unto his own city, and unto his own house, unto the city from whence he fled.

He shall dwell in that city until he stands before the congregation for judgment, until the death of the high priest that shall be in those days. Then the man slayer shall return, and come to his own city, and to his own house, to the city he fled from.’”