1 Corinthians 14:11

If, then, I do not know the meaning of someone’s language, I am a foreigner to the speaker, and he is a foreigner to me.

Note Literally a barbarian; twice in this verse

BSB · 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.
KJV · King James Version
If then I don’t know the meaning of the language, I would be to him who speaks a foreigner, and he who speaks would be a foreigner to me.
WEB · World English Bible
If then I know not the meaning of the voice, I shall be to him that speaketh a barbarian, and he that speaketh will be a barbarian unto me.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

I shall
1 Corinthians 14:21; Acts 28:2, 4; Romans 1:14; Colossians 3:11