Leviticus 10:8-11

8Then the LORD said to Aaron, 9“You and your sons are not to drink wine or other fermented drink whenever you go into the tent of meeting, or you will die. This is a lasting ordinance for the generations to come, 10so that you can distinguish between the holy and the common, between the unclean and the clean,

11and so you can teach the Israelites all the decrees the LORD has given them through Moses.”