When a priest goes to his work in the Holy, he is not allowed to drink wine because his actions are in concealment. His special meditations for the spiritual unification of upper and lower must be in silent and concealed in order to activate the flow of nourishments and blessings in all the worlds.
Wine as aspect of revealing secrets and raising the voice, things that the priest in not allowed to do. Moving from the Right to the Left would disconnect the priest from his work and a corrupted connection may cause his death.
Rabbi Yehuda and Rabbi Yitzhak were walking on the way and a child with a donkey was with them, carrying wine in honey. Rabbi Yehuda said; let’s study Torah while walking.
Continued in the next DZ
Daily Zohar # 2700 – Shemini – Loud wine