Allah's guidance, shivering of the skin and then relaxing of skin and hearts on remembrance of Allah

أعوذ بالله من الشيطان الرجيم 

Az-Zumar 39:23

ٱللَّهُ نَزَّلَ أَحْسَنَ ٱلْحَدِيثِ كِتَٰبًا مُّتَشَٰبِهًا مَّثَانِىَ تَقْشَعِرُّ مِنْهُ جُلُودُ ٱلَّذِينَ يَخْشَوْنَ رَبَّهُمْ ثُمَّ تَلِينُ جُلُودُهُمْ وَقُلُوبُهُمْ إِلَىٰ ذِكْرِ ٱللَّهِۚ ذَٰلِكَ هُدَى ٱللَّهِ يَهْدِى بِهِۦ مَن يَشَآءُۚ وَمَن يُضْلِلِ ٱللَّهُ فَمَا لَهُۥ مِنْ هَادٍ 

Allah 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 of Allah . That is the guidance of Allah by which He guides whom He wills. And one whom Allah leaves astray -  for him there is no guide.

Allah guides seekers of His pleasure

اعوذ بالله من الشيطن الرجيم

Surah 5. Al-Maeda, Verse 15:

قَدْ جَاءَكُم مِّنَ اللَّهِ نُورٌ وَكِتَابٌ مُّبِينٌ

Translation:

Indeed, there has come to you from Allah a light (Prophet Muhammad SAW) and a plain Book (this Quran).

Surah 5. Al-Maeda, Verse 16:

يَهْدِي بِهِ اللَّهُ مَنِ اتَّبَعَ رِضْوَانَهُ سُبُلَ السَّلَامِ وَيُخْرِجُهُم مِّنَ الظُّلُمَاتِ إِلَى النُّورِ بِإِذْنِهِ وَيَهْدِيهِمْ إِلَىٰ صِرَاطٍ مُّسْتَقِيمٍ

Translation:

Wherewith Allah guides all those who seek His Good Pleasure to ways of peace, and He brings them out of darkness by His Will unto light and guides them to a Straight Way (Islamic Monotheism).