1 Corinthians 14:13
King James Version
“Wherefore let him that speaketh in an tongue pray that he may interpret.”
Context
10There are, it may be, so many kinds of voices in the world, and none of them without signification.
11Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh a barbarian unto me.
12Even so ye, forasmuch as ye are zealous of spiritual seek that ye may excel to the edifying of the church.
13Wherefore let him that speaketh in an tongue pray that he may interpret.
14For if I pray in an tongue, my spirit prayeth, but my understanding is unfruitful.
15What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
16Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest?