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? The cup of blessing - The apostle speaks here of the Eucharist, which he illustrates by the כוס הברכה cos habberacah, cup of blessing, over which thanks were expressed at the conclusion of the passover. See this largely explained at the conclusion of the notes on Matthew 26:75, and in my Discourse upon the Eucharist, 8vo. 2nd edit. 1814.
The communion of the blood of Christ? - We who partake of this sacred cup, in commemoration of the death of Christ, are made partakers of his body and blood, and thus have fellowship with him; as those who partake of an idol feast, thereby, as much as they can, participate with the idol, to whom the sacrifice was offered. This I have proved at large in the above tract, to which I must refer the reader, as the subject is too voluminous to be inserted here.