1 Corinthians 14:7-9

Lexham English Bible

⁷ Likewise, the inanimate things which produce a sound, whether flute or lyre, if they do not produce a distinction in the tones, how will it be known what is played on the flute or on the lyre? 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.