Jesus did say he was the door. But that's all. The analogy is obvious, as Prodromos pointed out.
But when he instituted the Lord's Supper, that wasn't the end of it. He went much further, articulating the meaning, connecting it to his coming sacrifice, instructing the Apostles in how to use it, how often, and more.
However, in two of the gospels, as well as in I Corinthians 12 the cup is not called a cup of blood, but the cup of the New Covenant. In I Corinthians 10 the loaf is directly associated with the church as the body of Jesus Christ. Thus, it is evident that both the bread and the wine carry multiple levels of meaning.
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