Surah Az-Zumar, Verse 23

ٱللَّهُ نَزَّلَ أَحۡسَنَ ٱلۡحَدِيثِ كِتَٰبٗا مُّتَشَٰبِهٗا مَّثَانِيَ تَقۡشَعِرُّ مِنۡهُ جُلُودُ ٱلَّذِينَ يَخۡشَوۡنَ رَبَّهُمۡ ثُمَّ تَلِينُ جُلُودُهُمۡ وَقُلُوبُهُمۡ إِلَىٰ ذِكۡرِ ٱللَّهِۚ ذَٰلِكَ هُدَى ٱللَّهِ يَهۡدِي بِهِۦ مَن يَشَآءُۚ وَمَن يُضۡلِلِ ٱللَّهُ فَمَا لَهُۥ مِنۡ هَادٍ٢٣

al-lahu nazzala aḥsana l-ḥadīthi kitāban mutashābihan mathāniya taqshaʿirru min'hu julūdu alladhīna yakhshawna rabbahum thumma talīnu julūduhum waqulūbuhum ilā dhik'ri l-lahi dhālika hudā l-lahi yahdī bihi man yashāu waman yuḍ'lili l-lahu famā lahu min hādin

Allāh has sent down the best statement: a consistent Book wherein is reiteration. The skins shiver therefrom of those who fear their Lord; then their skins and their hearts relax at the remembrance [i.e., mention] of Allāh. That is the guidance of Allāh by which He guides whom He wills. And one whom Allāh sends astray - for him there is no guide.