1 Corinthians 14:10-15 New American Standard Bible (NASB)

10. There are, perhaps, a great many kinds of languages in the world, and no kind is without meaning.

11. If then I do not know the meaning of the language, I will be to the one who speaks a barbarian, and the one who speaks will be a barbarian to me.

12. So also you, since you are zealous of spiritual gifts, seek to abound for the edification of the church.

13. Therefore let one who speaks in a tongue pray that he may interpret.

14. For if I pray in a tongue, my spirit prays, but my mind is unfruitful.

15. What is the outcome then? I will pray with the spirit and I will pray with the mind also; I will sing with the spirit and I will sing with the mind also.

1 Corinthians 14