Leviticus 10:8-11

8And the LORD spake unto Aaron, saying,

9Drink no wine nor strong drink, thou, nor thy sons with thee, when ye go into the tent of meeting, that ye die not: it shall be a statute for ever throughout your generations:

10and that ye may put difference between the holy and the common, and between the unclean and the clean;

11and that ye may teach the children of Israel all the statutes which the LORD hath spoken unto them by the hand of Moses.