Leviticus 10:8-11

8Adonai spoke to Aaron saying:

9“Do not drink wine or fermented drink, neither you nor your sons with you, when you go into the Tent of Meeting, so that you do not die. This is to be a statute forever throughout your generations.

10You are to make a distinction between the holy and the common and between the unclean and the clean.

11And you are to teach Bnei-Yisrael all the statutes which Adonai has spoken to them through Moses.”