Numbers 6:3 - Ellicott's Commentary On The Whole Bible

He shall separate himself from wine and strong drink... — The law of the Nazirite in this respect, as in regard to defilement from the dead, was more strict than that which was enjoined upon the priests, thus typifying the entire surrender of the heart and life to God, and freedom from the distraction of earthly ties. The ideal of this separation, however, was not that of a life of monastic seclusion, but of action, and of uninterrupted devotion to the Divine service. The priests were forbidden to drink wine, or strong drink, when they entered the tabernacle to perform service there, but were not prohibited the use of wine at other times. Strong drink (shecar) is supposed to have been made of barley and dates or honey. The prohibition to eat any of the produce of the vine, even of that which was not intoxicating, seems designed to denote the entire consecration of the Nazirite to the Divine service, and the obligation which rested upon him to abstain from all the desires and delights of the flesh. The love of cakes made of raisins is coupled in Hosea 3:1 with idolatry.