Prophet Hud - 11:1 A.L.R. (This is) a Book whose verses have been made firm by One Wise and All-Knowing, and then explained and elaborated.
Their verses have been strengthened:
The Cave/18:27 Read what has been revealed to you from the Book of your Lord. Nothing can change or remove His words, and you will find no refuge besides Him.
وَاتْلُ مَٓا اُو۫حِيَ اِلَيْكَ مِنْ كِتَابِ رَبِّكَۚ لَا مُبَدِّلَ لِكَلِمَاتِه۪ وَلَنْ تَجِدَ مِنْ دُونِه۪ مُلْتَحَداً

The Rocky Tract/15:9 Surely We have sent down the Dhikr (Message) and it is We who will guard it.
اِنَّا نَحْنُ نَزَّلْنَا الذِّكْرَ وَاِنَّا لَهُ لَحَافِظُونَ

The Women/4:82 Do they not examine the Qur´an? Had it belonged to anyone other than Allah, they would have found many contradictions in it.
اَفَلَا يَتَدَبَّرُونَ الْقُرْاٰنَۜ وَلَوْ كَانَ مِنْ عِنْدِ غَيْرِ اللّٰهِ لَوَجَدُوا ف۪يهِ اخْتِلَافاً كَث۪يراً

The Companies/39:23 Allah has sent down the best hadith in a coherent book in two parts. The skins of those who honor their Lord tremble because of it. Then their skins and hearts soften towards the message of Allah. This is Allah´s guidance; He guides whom He wills and/or guides whom He wills to it. There is no guidance for anyone whom Allah leads astray
اَللّٰهُ نَزَّلَ اَحْسَنَ الْحَد۪يثِ كِتَاباً مُتَشَابِهاً مَثَانِيَۗ تَقْشَعِرُّ مِنْهُ جُلُودُ الَّذ۪ينَ يَخْشَوْنَ رَبَّهُمْۚ ثُمَّ تَل۪ينُ جُلُودُهُمْ وَقُلُوبُهُمْ اِلٰى ذِكْرِ اللّٰهِۜ ذٰلِكَ هُدَى اللّٰهِ يَهْد۪ي بِه۪ مَنْ يَشَٓاءُۜ وَمَنْ يُضْلِلِ اللّٰهُ فَمَا لَهُ مِنْ هَادٍ

Explained in Detail/41:42 Falsehood cannot come near it, neither before it nor after it. It is a revelation sent down by the Wise and Praiseworthy.
لَا يَأْت۪يهِ الْبَاطِلُ مِنْ بَيْنِ يَدَيْهِ وَلَا مِنْ خَلْفِه۪ۜ تَنْز۪يلٌ مِنْ حَك۪يمٍ حَم۪يدٍ

The Night Journey/17:88 "Say: "Even if all mankind and jinn gathered together to create the like of this Qur´an and supported each other in it, they could not create the like of it."
قُلْ لَئِنِ اجْتَمَعَتِ الْاِنْسُ وَالْجِنُّ عَلٰٓى اَنْ يَأْتُوا بِمِثْلِ هٰذَا الْقُرْاٰنِ لَا يَأْتُونَ بِمِثْلِه۪ وَلَوْ كَانَ بَعْضُهُمْ لِبَعْضٍ ظَه۪يراً

The Cave/18:27 Read what has been revealed to you from the Book of your Lord. Nothing can change or remove His words, and you will find no refuge besides Him.
وَاتْلُ مَٓا اُو۫حِيَ اِلَيْكَ مِنْ كِتَابِ رَبِّكَۚ لَا مُبَدِّلَ لِكَلِمَاتِه۪ وَلَنْ تَجِدَ مِنْ دُونِه۪ مُلْتَحَداً

The Defrauding/83:18 Indeed, the Book of the righteous is in Illiyyun.
كَلَّٓا اِنَّ كِتَابَ الْاَبْرَارِ لَف۪ي عِلِّيّ۪ينَۜ

The Cave/18:1 Praise be to Allah, Who has sent down the Book to His servant and has left no crookedness in it.
اَلْحَمْدُ لِلّٰهِ الَّـذ۪ٓي اَنْزَلَ عَلٰى عَبْدِهِ الْـكِتَابَ وَلَمْ يَجْعَلْ لَهُ عِـوَجا۔ًۜ
The Cave/18:2 A perfect (Book). to warn of a severe punishment from Him, and to give glad tidings to the righteous believers of a good reward for them.
قَيِّماً لِيُنْذِرَ بَأْساً شَد۪يداً مِنْ لَدُنْـهُ وَيُبَشِّرَ الْمُؤْمِن۪ينَ الَّذ۪ينَ يَعْمَلُونَ الصَّالِحَاتِ اَنَّ لَهُمْ اَجْراً حَسَناًۙ

Prophet Jonah/10:15 "When Our clear Verses are recited to them, those who do not hope to meet Us say: "Bring another Qur´an other than this, or change it!"Say: "I cannot change it from my own side. I follow only what has been revealed to me. If I disobey my Lord, I fear the punishment of a great Day."
وَاِذَا تُتْلٰى عَلَيْهِمْ اٰيَاتُنَا بَيِّنَاتٍۙ قَالَ الَّذ۪ينَ لَا يَرْجُونَ لِقَٓاءَنَا ائْتِ بِقُرْاٰنٍ غَيْرِ هٰذَٓا اَوْ بَدِّلْهُۜ قُلْ مَا يَكُونُ ل۪ٓي اَنْ اُبَدِّلَهُ مِنْ تِلْقَٓائِ۬ نَفْس۪يۚ اِنْ اَتَّبِعُ اِلَّا مَا يُوحٰٓى اِلَيَّۚ اِنّ۪ٓي اَخَافُ اِنْ عَصَيْتُ رَبّ۪ي عَذَابَ يَوْمٍ عَظ۪يمٍ


Prophet Hud/11:1 A.L.R. (This is) a Book whose verses have been made firm by One Wise and All-Knowing, and then explained and elaborated.
الٓـرٰ۠ كِتَابٌ اُحْكِمَتْ اٰيَاتُهُ ثُمَّ فُصِّلَتْ مِنْ لَدُنْ حَك۪يمٍ خَب۪يرٍۙ