Grounding the Qur'an

The Qur'an is Syifa which is a healer that belongs to Allah in contrast to Dawa which is a medicine that only relieves but does not necessarily cure
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The Qur'an is the words of Allah which is the power of Allah against anything including disease. For example, Jibril ruqyah, Jibril meruqyah with prayer which is in the name of Allah. The meaning is that the prayer becomes noble because it is in the name of Allah, Lord of the worlds.
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The Qur'an is Syifa and also Furqon, when the Qur'an is read to a body that is controlled by Satan, Satan will panic, make pain even overwhelm the spirit. Then after that, our enemy begins to appear, namely the devil.
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GOOD VS EVIL

Ibn Abbas radhiyallahu 'anhuma said,

إِنَّ لِلْحَسَنَةِ ضِيَاءً فِي الْوَجْهِ، وَنُورًا فِي الْقَلْبِ، وَسَعَةً فِي الرِّزْقِ، وَقُوَّةً فِي الْبَدَنِ، وَمَحَبَّةً فِي قُلُوبِ الْخَلْقِ، وَإِنَّ لِلسَّيِّئَةِ سَوَادًا فِي الْوَجْهِ، وَظُلْمَةً فِي الْقَبْرِ وَالْقَلْبِ، وَوَهْنًا فِي الْبَدَنِ، وَنَقْصًا فِي الرِّزْقِ، وَبُغْضَةً فِي قُلُوبِ الْخَلْقِ

There is light in the face, light in the heart, spaciousness in sustenance, strength in the body, and love for the hearts of creatures. Verily in the ugliness there is darkness in the face, darkness in the grave and the heart, weakness in the body, lack of sustenance, and hatred in the hearts of creatures." 

 

[Al-Answer Al-Kafy p. 62]