A.T. Robertson Commentary 1 Corinthians 11:25

"In like manner also the cup, after supper, saying, This cup is the new covenant in my blood: this do, as often as ye drink [it], in remembrance of me." — 1 Corinthians 11:25 (ASV)

After supper (μετα το δειπνησα). Μετα and the articular aorist active infinitive, "after the dining" (or the supping) as in Lu 22:20.

The new covenant (η καινη διαθηκη). For διαθηκη see on Mt 26:28. For καινος see on Lu 5:38; 22:20. The position of εστιν before εν τω αιματ (in my blood) makes it a secondary or additional predicate and not to be taken just with διαθηκη (covenant or will).

As oft as ye drink it (οσακις αν πινητε). Usual construction for general temporal clause of repetition (αν and the present subjunctive with οσακις). So in verse 26.