NET
11 If then I do not know the meaning of a language, I will be a foreigner to the speaker and the speaker a foreigner to me.
Darby
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.
KJV
11 Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh [shall be] a barbarian unto me.