1 Corinthians 14:9

Revised Standard Version

So with yourselves; if you in a tongue utter speech that is not intelligible, how will any one know what is said? For you will be speaking into the air.

Cross References

1 Corinthians 14:10

There are doubtless many different languages in the world, and none is without meaning;

1 Corinthians 9:26

Well, I do not run aimlessly, I do not box as one beating the air;