1 Corinthians 14:6-9

Diaglott(i) 6 Not but, brethren, if I should come to you with tongues speaking, what you shall I profit, if not to you I shall speak either in a revelation, or in knowledge, or in a prophesy, or in teaching? 7 In like manner the things without life a sound giving, whether a flute, or a harp, if a difference to the notes not they should give, how shall be known that being played on flute or that being played on harp? 8 Also for if an uncertain sound a trumpet should give, who will prepare himself for battle? 9 So also you through the tongue if not a well-marked word you give, how shall be know that having been spoken? you will be for into air speaking.