Parallel
1 Corinthians 14:9
Nestle 1904 Greek New Testament · 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.