1 Corinthians 14:4

4The [one]ὁspeakingλαλῶνin a tongueγλώσσῃhimselfἑαυτὸνedifiesοἰκοδομεῖ·the [one]ὁhoweverδὲprophesyingπροφητεύων[the] churchἐκκλησίανedifiesοἰκοδομεῖ.

The one speaking in a tongue edifies himself, but the one prophesying edifies the church.