Tongues are for a sign that someone has the Holy Spirit. It is a milk gift. Even today. But when someone goes into the meat understanding and revelations of Jesus Christ the tongues will cease.
1 Cor 12:28-31
28 And God has Though I speak with the tongues of men and of angels, but have not love, I have become sounding brass or a clangingcymbal.
1 Cor 13:8-11
8 Love never fails. But whether there are prophecies, they will fail; whether there are tongues, they will cease; whether there is knowledge, it will vanish away.
9 For we know in part appointed these in the church: first apostles, second prophets, third teachers, after that miracles, then gifts of healings, helps, administrations, varieties of tongues.
29 Are all apostles? Are all prophets? Are all teachers? Are all workers of miracles?
30 Do all have gifts of healings? Do all speak with tongues? Do all interpret?
31 But earnestly desire the best gifts. And yet I show you a more excellent way.
1 Cor 13:1
and we prophesy in part.
10 But when that which is perfect has come, then that which is in part will be done away.
11 When I was a child, I spoke as a child, I understood as a child, I thought as a child; but when I became a man, I put away childish things.
1 Cor 14:1-3
1 Pursue love, and desire spiritual gifts, but especially that you may prophesy.
2 For he who speaks in a tongue does not speak to men but to God, for no one understands him; however, in the spirit he speaks mysteries.
3 But he who prophesies speaks edification and exhortation and comfort to men.
1 Cor 14:5
5 I wish you all spoke with tongues, but even more that you prophesied; for he who prophesies is greater than he who speaks with tongues, unless indeed he interprets, that the church may receive edification.
1 Cor 14:6-13
6 But now, brethren, if I come to you speaking with tongues, what shall I profit you unless I speak to you either by revelation, by knowledge, by prophesying, or by teaching?
7 Even things without life, whether flute or harp, when they make a sound, unless they make a distinction in the sounds, how will it be known what is piped or played?
8 For if the trumpet makes an uncertain sound, who will prepare himself for battle?
9 So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air.
10 There are, it may be, so many kinds of languages in the world, and none of them is without significance.
11 Therefore, if I do not know the meaning of the language, I shall be a foreigner to him who speaks, and he who speaks will be a foreigner to me.
12 Even so you, since you are zealous for spiritual gifts, let it be for the edification of the church that you seek to excel.
13 Therefore let him who speaks in a tongue pray that he may interpret.