Because the gift of tongues fascinated the Corinthian Christians all out of proportion to its value, Paul had to set them straight on the matter, which he did in his first letter to them, 1Co chapters 12 to 14 being the only other references to tongues aside from Acts.
... Continuing his argument in 1Co chapter 13, Paul shows what really is important: “If I speak in the tongues of men and of angels but do not have love, I have become a sounding piece of brass or a clashing cymbal.”