1 Corinthians 14:2-4

New Revised Standard Version, Anglicised

² For those who speak in a tongue do not speak to other people but to God; for nobody understands them, since they are speaking mysteries in the Spirit. ³ On the other hand, those who prophesy speak to other people for their building up and encouragement and consolation. ⁴ Those who speak in a tongue build up themselves, but those who prophesy build up the church.