Paul is speaking of God's blessing as though it were the wine in the cup used in the ritual of the Lord's Supper. (See: [[rc://en/ta/man/jit/figs-metaphor]])
Paul is reminding the Corinthians of what they already know, that the cup of wine that we share represents us sharing in the blood of Christ. Alternate translation: "we share in the blood of Christ." (See: [[rc://en/ta/man/jit/figs-rquestion]])
Paul is reminding the Corinthians of what they already know. Alternate translation: "We share in the body of Christ when we share bread." (See: [[rc://en/ta/man/jit/figs-rquestion]])