New Revised Standard Version
If then I do not know the meaning of a sound, I will be a foreigner to the speaker and the speaker a foreigner to me.

Contemporary English Version
But if I don't understand the language that someone is using, we will be like foreigners to each other.

New American Bible
but if I do not know the meaning of a language, I shall be a foreigner to one who speaks it, and one who speaks it a foreigner to me.

Douay-Rheims Bible
If then I know not the power of the voice, I shall be to him to whom I speak a barbarian: and he that speaketh a barbarian to me.

If then I know not the power of the voice, I shall be to him to whom I speak a barbarian: and he that speaketh a barbarian to me.

I shall.

1 Corinthians 14:21 In the law it is written: In other tongues and other lips I will speak to this people: and neither so will they hear me, saith the Lord.

Acts 28:2,4 For kindling a fire, they refreshed us all, because of the present rain and of the cold. . . .

Romans 1:14 To the Greeks and to the barbarians, to the wise and to the unwise, I am a debtor.

Colossians 3:11 Where there is neither Gentile nor Jew, circumcision nor uncircumcision, Barbarian nor Scythian, bond nor free. But Christ is all and in all.