Surah Az-Zumar (The Successive Groups), Verse 23

اَللّٰهُ نَزَّلَ اَحْسَنَ الْحَدِیْثِ كِتٰبًا مُّتَشَابِهًا مَّثَانِیَ تَقْشَعِرُّ مِنْهُ جُلُوْدُ الَّذِیْنَ یَخْشَوْنَ رَبَّهُمْ ثُمَّ تَلِیْنُ جُلُوْدُهُمْ وَقُلُوْبُهُمْ اِلٰی ذِكْرِ اللّٰهِ ذٰلِكَ هُدَی اللّٰهِ یَهْدِیْ بِهٖ مَنْ یَّشَآءُ وَمَنْ یُّضْلِلِ اللّٰهُ فَمَا لَهٗ مِنْ هَادٍ ۟

Allahu nazzala ahsanal hadeesi Kitaabam mutashaa biham masaaniy taqsha'irru minhu juloodul lazeena yakhshawna Rabbahum summa taleenu julooduhum wa quloo buhum ilaa zikril laah; zaalika hudal laahi yahdee bihee mai yashaaa'; wa mai yudlilil laahu famaa lahoo min haad

“Allah has revealed (from time to time) the most beautiful Message in the form of a Book, consistent with itself, (yet) repeating (its teaching in various aspects): the skins of those who fear their Lord tremble thereat; then their skins and their hearts do soften to the celebration of Allah's praises. Such is the guidance of Allah: He guides therewith whom He pleases, but such as Allah leaves to stray, can have none to guide.”

Quran 39:23 (Yusuf Ali Translation)