Leviticus 10:8

6Moses said to Aaron, and to Eleazar and to Ithamar, his sons, “Don’t let the hair of your heads go loose, and don’t tear your clothes, so that you don’t die, and so that he will not be angry with all the congregation; but let your brothers, the whole house of Israel, bewail the burning which the LORD has kindled.

7You shall not go out from the door of the Tent of Meeting, lest you die; for the anointing oil of the LORD is on you.” They did according to the word of Moses.

8Then the LORD said to Aaron,

9“You and your sons are not to drink wine or strong drink whenever you go into the Tent of Meeting, or you will die. This shall be a statute forever throughout your generations.

10You are to make a distinction between the holy and the common, and between the unclean and the clean.