1 Corinthians 14:11

but if I do not know the meaning of the language , I will be a foreigner to the speaker and the speaker a foreigner to me .

If then I do not grasp the meaning of what someone is saying, I am a foreigner to the speaker, and the speaker is a foreigner to me.

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.