1 Corinthians 14:8-10

Lexham English Bible

⁸ For indeed, if the trumpet produces an indistinct sound, who will prepare for battle? ⁹ And so you through the tongue, unless you produce a clear message, how will it be known what is spoken? For you will be speaking into the air. ¹⁰ There are probably so many kinds of languages in the world, and none without meaning.