Priests: Special Laws Respecting: Not to Drink Wine While Attending in the Tabernacle
Source: TTT
Leviticus 10:9
“You and your sons are not to drink wine or strong drink when you enter the Tent of Meeting, or else you will die; this is a permanent statute for the generations to come.
Ezekiel 44:21
No priest may drink wine before he enters the inner court.