1 Corinthians 14:8-10

New American Standard Bible

⁸ For if ^(A)the trumpet produces an indistinct sound, who will prepare himself for battle? 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 ^(B)talking to the air. ¹⁰ There are, perhaps, a great many kinds of ^[a]languages in the world, and none is incapable of meaning.