The answer
We should not take it literally that our Lord will partake with them of real fruit of the vine; but in what it metaphorically represents. The fruit of the vine is an important part of the feast of the Passover, and of all feasts. The kingdom of heaven is often likened to a great feast. Here, our Lord is preparing His disciples for His crucifixion and the joy brought about thereafter. "Who for the joy that was set before Him endured the cross" (Heb 12:2). It is the joy set before Him, right before His eyes, (the salvation of mankind through His death on the cross) which He will partake of with them in heaven. He and His disciples (and subsequently all the believers in His redemptive act) will share together the honors and happiness of the heavenly world.Answered by His Eminence Metropolitan Youssef (opens in a new tab)