1 Corinthians 14:13

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.

12 It is the same with you. Since you are eager to have spiritual gifts, strive to excel in gifts that build up the church.

Therefore, the one who speaks in a tongue should pray that he may interpret.

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

15 What then shall I do? I will pray with my spirit, but I will also pray with my mind. I will sing with my spirit, but I will also sing with my mind.

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

Compare

BSB
Therefore, the one who speaks in a tongue should pray that he may interpret.
KJV
Wherefore let him that speaketh in an unknown tongue pray that he may interpret.
WEB
Therefore let him who speaks in another language pray that he may interpret.
ASV
Wherefore let him that speaketh in a tongue pray that he may interpret.
DARBY
Wherefore let him that speaks with a tongue pray that he may interpret.
BLB
Therefore, the one speaking in a tongue, let him pray that he may interpret.
ÅB
Derfor, den som taler med tunge, han be om at han må kunne tyde det!
OTB
Derfor bør den som taler med tunger be om at han kan tolke.
B1930
Derfor, den som taler med tunge, han bede om at han må kunne tyde det!

Study notes (Tyndale)

Original text and word study

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