This cup is the New Testament — Here is an undeniable figure, whereby the cup is put for the wine in the cup. And this is called, The New Testament in Christ's blood, which could not possibly mean, that it was the New Testament itself, but only the seal of it, and the sign of that blood which was shed to confirm it.
Related Commentaries of Luke 22:20
Luke 22:20
20 Likewise also the cup after supper, saying,This cup is the new testament in my blood, which is shed for you.