Parallel
1 Corinthians 14:11
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
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.
If, then, I do not know the meaning of someone’s language, I am a foreigner (note: Literally a barbarian; twice in this verse) to the speaker, and he is a foreigner to me.