Tractate Horayot - Chapter 3 - Mishnah 4 הוריות פרק ג׳ משנה ד׳

And who is the anointed priest? He who was anointed with the anointing oil and not he that has more garments. The only difference between a high priest who is anointed with the anointing oil and one who has more garments is the bull that is offered for [the unwitting transgression of] any of the commandments. And the only difference between the acting (high) priest and the former (high) priest is the bull on the Day of Atonement and the tenth part of the ephah. They are both equal in the service of the Day of Atonement, and both are commanded to marry a virgin and are forbidden to marry a widow; they are both forbidden to become impure for their relatives; they do not let their hair grow long, nor do they rend their clothes; and they return the (accidental) killer (from the city of refuge).