Liars are mentioned in the Quran in these verses:
[3:61] If anyone argues with you, despite the knowledge you have received, then say, “Let us summon our children and your children, our women and your women, ourselves and yourselves, then let us invoke God’s curse upon the liars.”
[6:28] As a matter of fact, (they only say this because) their secrets have been exposed. If they go back, they will commit exactly the same crimes. They are liars.
[9:42] If there were a quick material gain, and a short journey, they would have followed you. But the striving is just too much for them. They will swear by God: “If we could, we would have mobilized with you.” They thus hurt themselves, and God knows that they are liars.
[9:43] God has pardoned you: why did you give them permission (to stay behind), before you could distinguish those who are truthful from the liars?
[9:107] There are those who abuse the masjid by practicing idol worship, dividing the believers, and providing comfort to those who oppose God and His messenger. They solemnly swear: “Our intentions are honorable!” God bears witness that they are liars.
[11:27] The leaders who disbelieved among his people said, “We see that you are no more than a human being like us, and we see that the first people to follow you are the worst among us. We see that you do not possess any advantage over us. Indeed, we think you are liars.”
[12:74] They said, “What is the punishment for the thief, if you are liars?”
[16:39] He will then point out to everyone all the things they had disputed, and will let those who disbelieved know that they were liars.
[16:86] And when those who committed idol worship see their idols, they will say, “Our Lord, these are the idols we had set up beside You.” The idols will then confront them and say, “You are liars.”
[16:105] The only ones who fabricate false doctrines are those who do not believe in God’s revelations; they are the real liars.
[23:90] We have given them the truth, while they are liars.
[24:13] Only if they produced four witnesses (you may believe them). If they fail to produce the witnesses, then they are, according to God, liars.
[26:223] They pretend to listen, but most of them are liars.
[29:3] We have tested those before them, for God must distinguish those who are truthful, and He must expose the liars.
[29:12] Those who disbelieved said to those who believed, “If you follow our way, we will be responsible for your sins.” Not true; they cannot bear any of their sins. They are liars.
[33:60] Unless the hypocrites, and those with disease in their hearts, and the vicious liars of the city refrain (from persecuting you), we will surely grant you the upper hand, then they will be forced to leave within a short while.
[36:15] They said, “You are no more than human beings like us. The Most Gracious did not send down anything. You are liars.”
[37:152] “God has begotten a son.” Indeed, they are liars.
[39:3] Absolutely, the religion shall be devoted to God alone. Those who set up idols beside Him say, “We idolize them only to bring us closer to God; for they are in a better position!” God will judge them regarding their disputes. God does not guide such liars, disbelievers.
[58:18] The Day will come when God resurrects them all. They will swear to Him then, just as they swear to you now, thinking that they really are right! Indeed, they are the real liars.
[59:11] Have you noted those who are plagued with hypocrisy, and how they said to their companions in disbelief among the people of the scripture, “If you are evicted we will go out with you, and will never obey anyone who opposes you. If anyone fights you, we will fight on your side.” God bears witness that they are liars.
[63:1] When the hypocrites come to you they say, “We bear witness that you are the messenger of God.” God knows that you are His messenger, and God bears witness that the hypocrites are liars.
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