1 Corinthians 14:20-22

MLV(i) 20 Brethren, do not become children in your mindsets, (but be infants in malice), but become mature in your mindsets. 21 It has been written in the law, ‘I will be speaking to this people in different languages and by other lips, and thus they will not even hear me, says the Lord.’ 22 So-then foreign languages are for a sign, not to those who believe, but to the unbelieving, but prophesying is for a sign, not to the unbelieving, but to those who believe.