1 Corinthians 14:9

New International Version

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.

Cross References

1 Corinthians 14:10

Undoubtedly there are all sorts of languages in the world, yet none of them is without meaning.

1 Corinthians 9:26

Therefore I do not run like someone running aimlessly; I do not fight like a boxer beating the air.