Surah Yunus (Jonah), Verse 15

وَاِذَا تُتْلٰی عَلَیْهِمْ اٰیَاتُنَا بَیِّنٰتٍ قَالَ الَّذِیْنَ لَا یَرْجُوْنَ لِقَآءَنَا ائْتِ بِقُرْاٰنٍ غَیْرِ هٰذَاۤ اَوْ بَدِّلْهُ قُلْ مَا یَكُوْنُ لِیْۤ اَنْ اُبَدِّلَهٗ مِنْ تِلْقَآئِ نَفْسِیْ اِنْ اَتَّبِعُ اِلَّا مَا یُوْحٰۤی اِلَیَّ اِنِّیْۤ اَخَافُ اِنْ عَصَیْتُ رَبِّیْ عَذَابَ یَوْمٍ عَظِیْمٍ ۟

Wa izaa tutlaa 'alaihim aayaatunaa baiyinaatin qaalal lazeena laa yarjoona liqaaa'a na'ti bi Qur'aanin ghairi haazaaa aw baddilh; qul maa yakoonu leee 'an 'ubaddilahoo min tilqaaa'i nafsee in attabi'u illaa maa yoohaaa ilaiya inneee akhaafu in 'asaytu Rabbee 'azaaba Yawmin 'Azeem

“But when Our Clear Signs are rehearsed unto them, those who rest not their hope on their meeting with Us, Say: "Bring us a reading other than this, or change this," Say: "It is not for me, of my own accord, to change it: I follow naught but what is revealed unto me: if I were to disobey my Lord, I should myself fear the penalty of a Great Day (to come)."”

Quran 10:15 (Yusuf Ali Translation)