Al-An'am - 6:93

وَمَنْ أَظْلَمُ مِمَّنِ افْتَرَى عَلَى اللّهِ كَذِبًا أَوْ قَالَ أُوْحِيَ إِلَيَّ وَلَمْ يُوحَ إِلَيْهِ شَيْءٌ وَمَن قَالَ سَأُنزِلُ مِثْلَ مَا أَنَزلَ اللّهُ وَلَوْ تَرَى إِذِ الظَّالِمُونَ فِي غَمَرَاتِ الْمَوْتِ وَالْمَلآئِكَةُ بَاسِطُواْ أَيْدِيهِمْ أَخْرِجُواْ أَنفُسَكُمُ الْيَوْمَ تُجْزَوْنَ عَذَابَ الْهُونِ بِمَا كُنتُمْ تَقُولُونَ عَلَى اللّهِ غَيْرَ الْحَقِّ وَكُنتُمْ عَنْ آيَاتِهِ تَسْتَكْبِرُونَ
[6:93]
And who is more unjust than he who forges a lie against Allah, or says: It has been revealed to me; while nothing has been revealed to him, and he who says: I can reveal the like of what Allah has revealed? and if you had seen when the unjust shall be in the agonies of death and the angels shall spread forth their hands: Give up your souls; today shall you be recompensed with an ignominious chastisement because you spoke against Allah other than the truth and (because) you showed pride against His communications.
Who can be more wicked than one who inventeth a lie against Allah, or saith, "I have received inspiration," when he hath received none, or (again) who saith, "I can reveal the like of what Allah hath revealed"? If thou couldst but see how the wicked (do fare) in the flood of confusion at death! - the angels stretch forth their hands, (saying),"Yield up your souls: this day shall ye receive your reward,- a penalty of shame, for that ye used to tell lies against Allah, and scornfully to reject of His signs!"
Who is guilty of more wrong than he who forgeth a lie against Allah, or saith: I am inspired, when he is not inspired in aught; and who saith: I will reveal the like of that which Allah hath revealed? If thou couldst see, when the wrong-doers reach the pangs of death and the angels stretch their hands out (saying): Deliver up your souls. This day ye are awarded doom of degradation for that ye spake concerning Allah other than the truth, and used to scorn His portents.