1 Corinthians 14:11
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.
Cross-reference
1 Corinthians 14:21
Parallel
In 1 Cor 14:21, Paul quotes Isaiah about foreign tongues as a sign of judgment — supporting the foreigner analogy in 14:11.