1 Corinthians 14:26–28
14:26 What then shall we say, brothers and sisters? When you come together, each of you has a hymn, or a word of instruction, a revelation, a tongue or an interpretation. Everything must be done so that the church may be built up.
14:27 If anyone speaks in a tongue, two—or at the most three—should speak, one at a time, and someone must interpret.
14:28 If there is no interpreter, the speaker should keep quiet in the church and speak to himself and to God.