Tongues, then, are a sign, not for believers but for unbelievers; prophecy, however, is not for unbelievers but for believers.
NIV
Thus [unknown] tongues are meant for a [supernatural] sign, not for believers but for unbelievers [on the point of believing], while prophecy (inspired preaching and teaching, interpreting the divine will and purpose) is not for unbelievers [on the point of believing] but for believers.
AMP
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.
KJV
So if the whole church comes together and everyone speaks in tongues, and inquirers or unbelievers come in, will they not say that you are out of your mind?
NIV
Therefore, if the whole church assembles and all of you speak in [unknown] tongues, and the ungifted and uninitiated or unbelievers come in, will they not say that you are demented?
AMP
If 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?
KJV
Not a word from their mouth can be trusted; their heart is filled with malice. Their throat is an open grave; with their tongues they tell lies.
NIV
For there is nothing trustworthy or steadfast or truthful in their talk; their heart is destruction [or a destructive chasm, a yawning gulf]; their throat is an open sepulcher; they flatter and make smooth with their tongue. [Rom. 3:13.]AMP
For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulchre; they flatter with their tongue.
KJV
For three and a half days many from every people, tribe, language and nation will gaze on their bodies and refuse them burial.
NIV
For three and a half days men from the races and tribes and languages and nations will gaze at their dead bodies and will not allow them to be put in a tomb.
AMP
And they of the people and kindreds and tongues and nations shall see their dead bodies three days and an half, and shall not suffer their dead bodies to be put in graves.
KJV
Therefore, as tongues of fire lick up straw and as dry grass sinks down in the flames, so their roots will decay and their flowers blow away like dust; for they have rejected the law of the LORD Almighty and spurned the word of the Holy One of Israel.
NIV
Therefore, as the tongue of fire devours the stubble, and as the dry grass sinks down in the flame, so their root shall be like rottenness and their blossom shall go up like fine dust--because they have rejected and cast away the law and the teaching of the Lord of hosts and have not believed but have treated scornfully and have despised the word of the Holy One of Israel.
AMP
Therefore as the fire devoureth the stubble, and the flame consumeth the chaff, so their root shall be as rottenness, and their blossom shall go up as dust: because they have cast away the law of the LORD of hosts, and despised the word of the Holy One of Israel.
KJV
