1 Corinthians 14:22

Therefore, tongues are for a sign, not to those who believe, but to those who believe not: but prophecy is not for those who believe not, but for those who believe.

Mark 16:17

And these signs shall attend those who believe. In my name they shall cast out demons; they shall speak with new tongues;

1 Corinthians 14:1

Cultivate love, and earnestly desire spiritual gifts, but rather that you may prophesy.

Acts 2:6-12

When the report of this had gone abroad, the multitude came together; and they were perplexed, for each one heard them speak in his own language.

Acts 2:32-36

This Jesus has God raised up, of which we all are witnesses.

knowing this, that law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for the unholy and for scorners, for murderers of fathers and murderers of mothers, for man-slayers,

Treasury of Scripture Knowledge

Summary

1 Corinthians 14:22

Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.