1 Corinthians 14:9-11

New American Standard Bible

⁹ So you too, unless you produce intelligible speech by the tongue, how will it be known what is spoken? For you will just be ^(A)talking to the air. ¹⁰ There are, perhaps, a great many kinds of ^[a]languages in the world, and none is incapable of meaning. ¹¹ So if I do not know the meaning of the language, I will be ^(B)unintelligible to the one who speaks, and the one who speaks will be unintelligible ^[b]to me.