Leviticus 10:9-11

10:9 “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, 10:10 as well as to distinguish between the holy and the common, and between the unclean and the clean, 10:11 and to teach the Israelites all the statutes that the Lord has spoken to them through Moses.”