Leviticus 10:7-11

You shall not even go out from the doorway of the tent of meeting, or you will die; for the Lord’s anointing oil is upon you.” So they did according to the word of Moses.

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 do not die—it is a permanent statute throughout your generations—

and 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.”