1 Corinthians 10:17 - Ellicott's Commentary On The Whole Bible

For we being many are one bread. — Better, For it is one bread, and we, the many, are one body, for we all take a portion of that one bread. This verse explains how “the breaking” of the bread was the significant act which expressed sacramentally the communion of the body of Christ. There is one bread, it is broken into many pieces, and as we all (though each receives only a fragment) partake of the one bread which unbroken consisted of these pieces, we though many individuals are one body, even the Body of Christ with whom, as well as with each other, we have communion in that act.