Where has Christ promised that he will as certainly feed and nourish believers with his body and bleed, as they eat of this broken bread, and drink of this cup?

In the institution of the supper, which is thus expressed: [227] "The Lord Jesus, the same night in which he was betrayed, took bread, and when he had given thanks, he brake it, and: said: eat, this is my body, which is broken for you; this do 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 ye, as often as ye drink it, in remembrance of me. For, as often as ye eat this bread, and drink this cup, ye do show the Lord's death till he come." 1 Cor.11:23-26. This promise is repeated by the holy apostle Paul, where he says "The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? For we being many are one bread, and one body: for we are all partakers of that one bread." 1 Cor.10:16, 17.

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Footnotes:

[227] 1:Cor. 11:23-25; Matt. 26:26-28; Mark 14:22-24; Luke 22:19, 20; 1:Cor. 10:16, 17.