1 Corinthians 14:11

⁹ So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.

¹⁰ There are, it may be, so many kinds of voices in the world, and none of them is without signification.

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.

¹² Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church.

¹³ Wherefore let him that speaketh in an unknown tongue pray that he may interpret.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: 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.
KJV: 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.
WEB: 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.
ASV: 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.
DARBY: 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.
BLB: Therefore unless I know the power of the voice, I will be a barbarian to the one speaking, and the one speaking, a barbarian to me.

ÅB: dersom jeg altså ikke kjenner språkets betydning, blir jeg en utlending for den som taler, og den som taler, blir en utlending for meg.
OTB: Så hvis jeg ikke kjenner betydningen av språket, vil jeg være en fremmed for den som taler, og den som taler vil være en fremmed for meg.
B1930: dersom jeg altså ikke kjenner sprogets betydning, blir jeg en utlending for den som taler, og den som taler, blir en utlending for mig.

Acts 28:2
And the barbarous people shewed us no little kindness: for they kindled a fire, and received us every one, because of the present rain, and because of the cold.
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Romans 1:14
I am debtor both to the Greeks, and to the Barbarians; both to the wise, and to the unwise.
Read in context
Acts 28:4
And when the barbarians saw the venomous beast hang on his hand, they said among themselves, No doubt this man is a murderer, whom, though he hath escaped the sea, yet vengeance suffereth not to live.
Read in context
1 Corinthians 14:21
In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord.
Read in context
Colossians 3:11
Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.
Read in context