I want to repeat this, because no one has really said anything about it:
Tongues, generally-speaking, were given for one primary purpose: as a sign to unbelieving Jews, as a fulfillment of prophecy. 1Cor 14:21 says "In 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." This prophecy is found in !saiah 28:11 & 12: "For with stammering lips and another tongue will he speak to this people. To 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." Tongues was given for the sake of the Jews, as a sign that their promised rest in the Messiah had come, yet, in Isaiah, they were warned that they wouldn't hear it, and so it came to pass. These are those referred to in 1Cor 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."
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