Rashi on Leviticus 10:11/רש"י על ויקרא י׳:י״א

1ולהורת AND TO TEACH [THE CHILDREN OF ISRAEL] — This informs us that an intoxicated person is forbidden to pronounce religious decisions. One might think that if he does so he is liable to the death penalty! It, however, says: “[Do not drink wine] thou (Aaron), nor thy sons with thee … lest ye die” — priests when they minister in a state of intoxication are punishable by death, but the Sages when they thus render decisions are not punishable by death (Sifra, Shemini, Section 1 6).