1 Corinthians 14:2-4

Young's Literal Translation

² for he who is speaking in an [unknown] tongue -- to men he doth not speak, but to God, for no one doth hearken, and in spirit he doth speak secrets;

³ and he who is prophesying to men doth speak edification, and exhortation, and comfort;

⁴ he who is speaking in an [unknown] tongue, himself doth edify, and he who is prophesying, an assembly doth edify;