1 Corinthians 14:22

Therefore, [unknown] tongues are [meant] for a [supernatural] sign, not to believers but to unbelievers [who might be receptive]; while prophecy [foretelling the future, speaking a new message from God to the people] is not for unbelievers but for believers.

Mark 16:17

These signs will accompany those who have believed: in My name they will cast out demons, they will speak in new tongues;

1 Corinthians 14:1

Pursue [this] love [with eagerness, make it your goal], yet earnestly desire and cultivate the spiritual gifts [to be used by believers for the benefit of the church], but especially that you may prophesy [to foretell the future, to speak a new message from God to the people].

Acts 2:6-12

And when this sound was heard, a crowd gathered, and they were bewildered because each one was hearing those in the upper room speaking in his own language or dialect.

Acts 2:32-36

God raised this Jesus [bodily from the dead], and of that [fact] we are all witnesses.

1 Timothy 1:9

understanding the fact that law is not enacted for the righteous person [the one in right standing with God], but for lawless and rebellious people, for the ungodly and sinful, for the irreverent and profane, for those who kill their fathers or mothers, for murderers,

Treasury of Scripture Knowledge

Summary

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.

Not to

Bible References

For a

Mark 16:17
These signs will accompany those who have believed: in My name they will cast out demons, they will speak in new tongues;
Acts 2:6
And when this sound was heard, a crowd gathered, and they were bewildered because each one was hearing those in the upper room speaking in his own language or dialect.

Not to

1 Timothy 1:9
understanding the fact that law is not enacted for the righteous person [the one in right standing with God], but for lawless and rebellious people, for the ungodly and sinful, for the irreverent and profane, for those who kill their fathers or mothers, for murderers,

But for

1 Corinthians 14:3
But [on the other hand] the one who prophesies speaks to people for edification [to promote their spiritual growth] and [speaks words of] encouragement [to uphold and advise them concerning the matters of God] and [speaks words of] consolation [to compassionately comfort them].

General references

1 Corinthians 12:7
But to each one is given the manifestation of the Spirit [the spiritual illumination and the enabling of the Holy Spirit] for the common good.
1 Thessalonians 5:20
Do not scorn or reject gifts of prophecy or prophecies [spoken revelations—words of instruction or exhortation or warning].