Leviticus 10:8

Moses said to Aaron, and to Eleazar and to Ithamar, his sons, "Don't let the hair of your heads go loose, neither tear your clothes; that you don't die, and that he not be angry with all the congregation: but let your brothers, the whole house of Israel, bewail the burning which Yahweh has kindled.

You shall not go out from the door of the Tent of Meeting, lest you die; for the anointing oil of Yahweh is on you." They did according to the word of Moses.

Drink no wine nor strong drink, you, nor your sons with you, when you go into the Tent of Meeting, that you don't die: it shall be a statute forever throughout your generations:

and that you are to make a distinction between the holy and the common, and between the unclean and the clean;