1 Corinthians 14:8-10

Revised Standard Version

⁸ And if the bugle gives an indistinct sound, who will get ready for battle? ⁹ 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. ¹⁰ There are doubtless many different languages in the world, and none is without meaning;