1 Corinthians 14:8 in the King James Version
For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
Context
7 Even lifeless things that make a sound, 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.