1 Corinthians 14:20-33 Revised Standard Version (RSV)
20 Brethren, do not be children in your thinking; be babes in evil, but in thinking be mature. 21 In the law it is written, “By men of strange tongues and by the lips of foreigners will I speak to this people, and even then they will not listen to me, says the Lord.” 22 Thus, tongues are a sign not for believers but for unbelievers, while prophecy is not for unbelievers but for believers. 23 If, therefore, the whole church assembles and all speak in tongues, and outsiders or unbelievers enter, will they not say that you are mad? 24 But if all prophesy, and an unbeliever or outsider enters, he is convicted by all, he is called to account by all, 25 the secrets of his heart are disclosed; and so, falling on his face, he will worship God and declare that God is really among you.
26 What then, brethren? When you come together, each one has a hymn, a lesson, a revelation, a tongue, or an interpretation. Let all things be done for edification. 27 If any speak in a tongue, let there be only two or at most three, and each in turn; and let one interpret. 28 But if there is no one to interpret, let each of them keep silence in church and speak to himself and to God. 29 Let two or three prophets speak, and let the others weigh what is said. 30 If a revelation is made to another sitting by, let the first be silent. 31 For you can all prophesy one by one, so that all may learn and all be encouraged; 32 and the spirits of prophets are subject to prophets. 33 For God is not a God of confusion but of peace.
As in all the churches of the saints,
1 Corinthians 14:39-40 Revised Standard Version (RSV)
39 So, my brethren, earnestly desire to prophesy, and do not forbid speaking in tongues; 40 but all things should be done decently and in order.