ISB ~ 1 Corinthians 14 v22

unbelievers:Since this can also be translated “unfaithful”, it is uncertain whether Paul is thinking of unbaptized pagans or unfaithful Christians or both.

prophecy is not for unbelievers:I.e., not primarily for unbelievers or the unfaithful. It is foremost a gift to edify the assembled church, although it can benefit visitors and newcomers as well (14:24-25).