1 Corinthians 14:9-11 Darby Translation (DARBY)
9 Thus also *ye* with the tongue, unless ye give a distinct speech, how shall it be known what is spoken? for ye will be speaking to the air.
10 There are, it may be, so many kinds of voices in the world, and none of undistinguishable sound.
11 If therefore I do not know the power of the sound, I shall be to him that speaks a barbarian, and he that speaks a barbarian for me.