Mark 14:25
Truly I tell you, I will not drink again from the fruit of the vine until that day when I drink it new in the kingdom of God — the abstention vow is the Last Supper's eschatological orientation: the meal that looks back to the Exodus (Passover) and forward to the cross (covenant blood) also looks forward to the final consummation. Until that day: the kingdom banquet of Isaiah 25:6 and the wedding supper of the Lamb (Revelation 19:9) is the meal Jesus is anticipating.