1 Corinthians 14:7-9

World English Bible

⁷ Even things without life, giving a voice, whether pipe or harp, if they didn’t give a distinction in the sounds, how would it be known what is piped or harped? ⁸ For if the trumpet gave an uncertain sound, who would prepare himself for war? ⁹ So also you, unless you uttered by the tongue words easy to understand, how would it be known what is spoken? For you would be speaking into the air.