This is My blood of the covenant, which is poured out for many for the forgiveness of sins.
But I say unto you, I will not drink henceforth,.... From whence it seems natural to conclude, that Christ had drank of the cup in the supper, as well as at the passover; and it is reasonable to believe, that he also ate of the bread; since it appears from what has been observed before; see Gill on Mat 26:26, that none might eat, till...
This cup and wine represent His blood about to be shed, just as the bread represented His body. The new covenant, ratified by His blood, fulfills the old covenant sealed by animal sacrifice at Sinai. God forgives transgressions through this blood because it is the life of Jesus Himself, the sacred writers use blood to signify life itself, and that life given is the appointed and efficacious way by which sins are remitted.
AI summary
This cup or wine is His blood sacramentally; by it the new covenant is made, for covenants and leagues were ratified by the pouring of wine and the shedding of blood.
AI summary