Parallel
1 Corinthians 14:9
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Οὕτως καὶ ὑμεῖς διὰ τῆς γλώσσης ἐὰν μὴ εὔσημον λόγον δῶτε, πῶς γνωσθήσεται τὸ λαλούμενον; Ἔσεσθε γὰρ εἰς ἀέρα λαλοῦντες.
So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air.