Targum zu Bamidbar 35:25

and the congregation shall release the manslayer from the hand of the avenger of blood, and make him return to his city of refuge whither he had fled; and he shall dwell there until the time that the high priest die, whom the multitude (sagia) had anointed with the oil of anointing;-because he did not pray on the Day of Atonement in the Holy of Holies concerning the three great transgressions, that the people of the house of Israel might not be smitten for strange worship, or impure connexions, or the shedding of innocent blood, when it was in his power to obviate them by his prayer, and he prayed not, therefore hath he been condemned to die in that year.