Leviticus 10:9 Do not drink wine nor strong drink, thou, nor thy sons with thee, when ye go into the tabernacle of the congregation, lest ye die: it shall be a statute for ever throughout your generations: 10 And that ye may put difference between holy and unholy, and between unclean and clean; 11 And that ye may teach the children of Israel all the statutes which the LORD hath spoken unto them by the hand of Moses.
God didn’t want His men to drink wine or strong drink when they would be going about their ministry. They would need clear heads and hearts. They would have to decide between the holy and the unholy. They would have to discern between the clean and unclean. They would have to teach God’s people God’s truth. They needed to see the importance of being ready for such an important task.