Le Lévitique 21:10 Références de la Michna : Mishnah Yoma, Mishnah Horayot & Pirkei Avot

They delivered to him elders from the elders of the court and they read before him [throughout the seven days] from the order of the day. And they say to him, “Sir, high priest, you read it yourself with your own mouth, lest you have forgotten or lest you have never learned.” On the eve of Yom HaKippurim in the morning they place him at the eastern gate and pass before him oxen, rams and sheep, so that he may recognize and become familiar with the service.

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).

Rabbi Ishmael his son said: He who learns in order to teach, it is granted to him to study and to teach; But he who learns in order to practice, it is granted to him to learn and to teach and to practice. Rabbi Zadok said: do not make them a crown for self-exaltation, nor a spade with which to dig. So too Hillel used to say, “And he that puts the crown to his own use shall perish.” Thus you have learned, anyone who derives worldly benefit from the words of the Torah, removes his life from the world.