1 Corinthians 14:12-13, 26-28

So it is with you, since you are so very eager to have spiritual gifts and manifestations of the Spirit, strive to excel in ways that will build up the church [spiritually]. Therefore let one who speaks in a tongue pray that he may [be gifted to] translate or explain [what he says].

What then is the right course, believers? When you meet together, each one has a psalm, a teaching, a revelation (disclosure of special knowledge), a tongue, or an interpretation. Let everything be constructive and edifying and done for the good of all the church. If anyone speaks in a tongue, it should be limited to two or at the most three, and each one speaking in turn, and one must interpret [what is said]. But if there is no one to interpret, the one [who wishes to speak in a tongue] must keep silent in church; let him speak to himself and to God.