For as often as you eat this bread, and drink this cup, you do show the Lord's death till he comes.
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Ambrose of Milan
AD 397
As often as we receive, we proclaim the death of the Lord. If death, we proclaim the remission of sins. If, as often as blood is shed, it is shed for the remission of sins, I ought always to accept him, that he may always dismiss my sins. I, who always sin, should always have a remedy. .
Paul shows that the Lord’s Supper is not a meal in the normal sense but spiritual medicine, which purifies the recipient if he partakes of it reverently. It is the memorial of our redemption, so that mindful of our Redeemer we might follow him more closely. Commentary on Paul’s Epistles.
Proclaiming the death according to the flesh of the only begotten Son of God, that is, of Jesus Christ, and confessing his resurrection from the dead and his ascension into heaven, we celebrate the unbloody sacrifice in the churches, and we thus approach the spiritual blessings and are made holy, becoming partakers of the holy flesh and of the precious blood of Christ, the Savior of us all.
For as Christ in regard to the bread and the cup said, Do this in remembrance of Me, revealing to us the cause of the giving of the Mystery, and besides what else He said, declaring this to be a sufficient cause to ground our religious fear upon:— (for when you consider what your Master has suffered for you, you will the better deny yourself:)— so also Paul says here: as often as you eat ye do proclaim His death. And this is that Supper. Then intimating that it abides unto the end, he says, till He come.
We also, our Father, thank Thee for the precious blood of Jesus Christ, which was shed for us and for His precious body, whereof we celebrate this representation, as Himself appointed us, "to show forth His death."