1 Corinthians 14:10-13 Young's Literal Translation Of The Holy Bible (YLT98)

10. There are, it may be, so many kinds of voices in the world, and none of them is unmeaning,

11. if, then, I do not know the power of the voice, I shall be to him who is speaking a foreigner, and he who is speaking, is to me a foreigner;

12. so also ye, since ye are earnestly desirous of spiritual gifts, for the building up of the assembly seek that ye may abound;

13. wherefore he who is speaking in an [unknown] tongue--let him pray that he may interpret;

1 Corinthians 14