10 Moreover, the blessed Apostle Paul, chosen and sent by the Lord, and appointed a preacher of the Gospel truth, lays down these very things in his epistle, saying, “The Lord Jesus, the same night in which He was betrayed, took bread; and when He had given thanks, He broke it, and said, This is my body, which shall be given for you: do this in remembrance of me. After the same manner also He took the cup, when he had supped, saying, This cup is the new testament in my blood: this do, as oft as you drink it, in remembrance of me.
For as often as you eat this bread and drink this cup, you shall show forth the Lord's death until He come.” But if it is both enjoined by the Lord, and the same thing is confirmed and delivered by His apostle, that as often as we drink, we do in remembrance of the Lord the same thing which the Lord also did, we find that what was commanded is not observed by us, unless we also do what the Lord did; and that mixing the Lord's cup in like manner we do not depart from the divine teaching; but that we must not at all depart from the evangelical precepts, and that disciples ought also to observe and to do the same things which the Master both taught dud did.
The blessed apostle in another place more earnestly and strongly teaches, saying, “I wonder that you are so soon removed from Him that called you into grace, unto another gospel, which is not another; but there are some that trouble you, and would pervert the Gospel of Christ. But though we, or an angel from heaven, preach any otherwise than that which we have preached to you, let him be anathema. As we said before, so say I now again, If any man preach any other gospel unto you than that you have received, let him be anathema.”
Source: The Epistles of Cyprian (New Advent)