We read in Luke 1:13-15 (NRSVCE) of the Angel foretelling the birth of John the Baptist:
Do not be afraid, Zechariah, for your prayer has been heard. Your wife Elizabeth will bear you a son, and you will name him John. You will have joy and gladness, and many will rejoice at his birth, for he will be great in the sight of the Lord. He must never drink wine or strong drink.
We go on to hear John saying in Mtt 3: 11
I baptize you with water for repentance, but he who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and fire.
One can relate that John the Baptist was restrained from drinking wine because he was to become an example of ascetic life and repentance. But, no such abstinence was mandated for Jesus except for the period of his fasting in the wilderness . He would in fact, remark on a later occasion:
Matt 11: 18-19: For John came neither eating nor drinking, and they say, ‘He has a demon.’ The Son of Man came eating and drinking, and they say, ‘Here is a glutton and a drunkard, a friend of tax collectors and sinners.’
One is therefore, inclined to conclude that both Jesus John the Baptist were separately oriented for the Mission that each was entrusted with. But what was special in the Mission of John that mandated that he must not drink wine?
What was special with the Mission of John the Baptist which mandated that he must not drink wine?