Leviticus 10:8-11

Then the LORD spoke to Aaron, “Do not drink wine or strong drink, you and your sons with you, when you enter into the Meeting Tent, so that you do not die, which is a perpetual statute throughout your generations, as well as to distinguish between the holy and the common, and between the unclean and the clean, and to teach the Israelites all the statutes that the LORD has spoken to them through Moses.”