Leviticus 10:6-10

Then Moses said to Aaron and to his sons Eleazar and Ithamar, “Do not uncover your heads nor tear your clothes, so that you do not die and He does not become wrathful against all the congregation. But your kinsmen, the entire house of Israel, shall weep for the burning which the Lord has brought about.

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,