1 Corinthians 14:9

Young's Literal Translation 1862

so also ye, if through the tongue, speech easily understood ye may not give -- how shall that which is spoken be known? for ye shall be speaking to air.

Cross References

1 Corinthians 14:10

There are, it may be, so many kinds of voices in the world, and none of them is unmeaning,

1 Corinthians 9:26

I, therefore, thus run, not as uncertainly, thus I fight, as not beating air;