Gift of Tongues

Boyd’s Bible Dictionary:

“And the whole earth was of one language, and of one speech”
(Gen. 11:11And the whole earth was of one language, and of one speech. (Genesis 11:1)). Confusion of tongues and dispersion of peoples coincident (Gen. 11:7-97Go to, let us go down, and there confound their language, that they may not understand one another's speech. 8So the Lord scattered them abroad from thence upon the face of all the earth: and they left off to build the city. 9Therefore is the name of it called Babel; because the Lord did there confound the language of all the earth: and from thence did the Lord scatter them abroad upon the face of all the earth. (Genesis 11:7‑9)). “New tongues” (Mark 16:1717And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; (Mark 16:17)), is the first notice of a gift specially characteristic of the first outpouring of the Spirit. Ten days afterward the promise was fulfilled in the Pentecostal phenomenon (Acts 2:1-131And when the day of Pentecost was fully come, they were all with one accord in one place. 2And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting. 3And there appeared unto them cloven tongues like as of fire, and it sat upon each of them. 4And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance. 5And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven. 6Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language. 7And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galileans? 8And how hear we every man in our own tongue, wherein we were born? 9Parthians, and Medes, and Elamites, and the dwellers in Mesopotamia, and in Judea, and Cappadocia, in Pontus, and Asia, 10Phrygia, and Pamphylia, in Egypt, and in the parts of Libya about Cyrene, and strangers of Rome, Jews and proselytes, 11Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God. 12And they were all amazed, and were in doubt, saying one to another, What meaneth this? 13Others mocking said, These men are full of new wine. (Acts 2:1‑13)).

Concise Bible Dictionary:

This gift was in the early church, and was a sign “to them that believed not,” in fulfillment of Isaiah 28:11-1211For with stammering lips and another tongue will he speak to this people. 12To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear. (Isaiah 28:11‑12); compare 1 Corinthians 14:2121In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord. (1 Corinthians 14:21). The gift was exhibited in a special way on the day of Pentecost, when people of many lands heard the wonderful things of God each in his own language. In the assembly these gifts were not to be exercised unless there was present an interpreter, that the saints might be edified. Paul thanked God that he spake with tongues more than all at Corinth; but in the assembly he would rather speak five words through his understanding, that he might teach others, than ten thousand words in a tongue (1 Cor. 12:10,28,3010To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues: (1 Corinthians 12:10)
28And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues. (1 Corinthians 12:28)
30Have all the gifts of healing? do all speak with tongues? do all interpret? (1 Corinthians 12:30)
; 1 Cor. 13:1,81Though I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal. (1 Corinthians 13:1)
8Charity never faileth: but whether there be prophecies, they shall fail; whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away. (1 Corinthians 13:8)
; 1 Cor. 14:2-392For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries. 3But he that prophesieth speaketh unto men to edification, and exhortation, and comfort. 4He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church. 5I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying. 6Now, brethren, if I come unto you speaking with tongues, what shall I profit you, except I shall speak to you either by revelation, or by knowledge, or by prophesying, or by doctrine? 7And even things without life giving sound, whether pipe or harp, except they give a distinction in the sounds, how shall it be known what is piped or harped? 8For if the trumpet give an uncertain sound, who shall prepare himself to the battle? 9So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air. 10There are, it may be, so many kinds of voices in the world, and none of them is without signification. 11Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me. 12Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church. 13Wherefore let him that speaketh in an unknown tongue pray that he may interpret. 14For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful. 15What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also. 16Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest? 17For thou verily givest thanks well, but the other is not edified. 18I thank my God, I speak with tongues more than ye all: 19Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue. 20Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding be men. 21In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord. 22Wherefore 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. 23If therefore the whole church be come together into one place, and all speak with tongues, and there come in those that are unlearned, or unbelievers, will they not say that ye are mad? 24But if all prophesy, and there come in one that believeth not, or one unlearned, he is convinced of all, he is judged of all: 25And thus are the secrets of his heart made manifest; and so falling down on his face he will worship God, and report that God is in you of a truth. 26How is it then, brethren? when ye come together, every one of you hath a psalm, hath a doctrine, hath a tongue, hath a revelation, hath an interpretation. Let all things be done unto edifying. 27If any man speak in an unknown tongue, let it be by two, or at the most by three, and that by course; and let one interpret. 28But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God. 29Let the prophets speak two or three, and let the other judge. 30If any thing be revealed to another that sitteth by, let the first hold his peace. 31For ye may all prophesy one by one, that all may learn, and all may be comforted. 32And the spirits of the prophets are subject to the prophets. 33For God is not the author of confusion, but of peace, as in all churches of the saints. 34Let your women keep silence in the churches: for it is not permitted unto them to speak; but they are commanded to be under obedience, as also saith the law. 35And if they will learn any thing, let them ask their husbands at home: for it is a shame for women to speak in the church. 36What? came the word of God out from you? or came it unto you only? 37If any man think himself to be a prophet, or spiritual, let him acknowledge that the things that I write unto you are the commandments of the Lord. 38But if any man be ignorant, let him be ignorant. 39Wherefore, brethren, covet to prophesy, and forbid not to speak with tongues. (1 Corinthians 14:2‑39)).
The expression “unknown tongue” is unhappy, because it has led some to think that the gift of tongues consisted of a sort of unintelligible gibberish. The word “unknown” has been added in the AV, where it should read simply “tongue.” At Pentecost it was shown that the gift of “tongues” was in a person speaking a language which he had never learned, but which was at once understood by those who knew it.