Leviticus 10:8-11

The LORD then spoke to Aaron, saying, “Do not drink wine or strong drink, neither you nor your sons with you, when you come into the tent of meeting, so that you will not die—it is a perpetual statute throughout your generations— and so as to make a distinction between the holy and the profane, and between the unclean and the clean, and so as to teach the sons of Israel all the statutes which the LORD has spoken to them through Moses.”