1 Corinthians 14:27 provides the practical rule that tongues must be interpreted—fulfilling the prayer for interpretation Paul commands here.

1 Corinthians 14:5 states that tongues with interpretation build up the church, directly motivating the command to pray for interpretation.

1 Corinthians 12:10 lists interpretation of tongues as a distinct gift, showing what the speaker should pray for.

1 Corinthians 12:30 asks 'Do all interpret?' implying not everyone has this gift, so the speaker must specifically pray for it.