The Qur'an is a Cure and a Mercy

Allah tells us that His Book, which He has revealed to His Messenger Muhammad ﷺ, the Qur'an to which falsehood cannot come, from before it or behind it, (it is) sent down by the All-Wise, Worthy of all praise, is a cure and a mercy for the believers, meaning that it takes away whatever is in their hearts of doubt, hypocrisy, Shirk, confusion and inclination towards falsehood. The Qur'an cures all of that. It is also a mercy through which one attains faith and wisdom and seeks goodness. This is only for those who believe in it and accept it as truthful, it is a cure and a mercy only for such people. As for the disbeliever who is wronging himself by his disbelief, when he hears the Qur'an, it only makes him further from the truth and increases him in his disbelief. The problem lies with the disbeliever himself, not with the Qur'an, as Allah says:

قُلْ هُوَ لِلَّذِينَ ءَامَنُواْ هُدًى وَشِفَآءٌ وَالَّذِينَ لاَ يُؤْمِنُونَ فِى ءَاذَانِهِمْ وَقْرٌ وَهُوَ عَلَيْهِمْ عَمًى أُوْلَـئِكَ يُنَادَوْنَ مِن مَّكَانٍ بَعِيدٍ

We can now move to the last verse (82) cited above: وَنُنَزِّلُ مِنَ الْقُرْ‌آنِ مَا هُوَ شِفَاءٌ (And We reveal the Qur'an which is a cure). That the Holy Qur'an cures hearts and delivers people from shirk and kufr, low morals and spiritual ailments is no secret. The entire Muslim ummah agrees with it. And according to some ` Ulama', the way the Qur’ an is a cure for spiritual ailments, it is also a cure for physical diseases. The sense is that reciting the verses of the Qur'an and blowing the breath on the body of the sick person or to write its words on an amulet and putting it around the neck is also expected to be a cure for physical diseases. Hadith narratives bear testimony to it. The Hadith of Sayyidna Abu Said al-Khudri ؓ can be seen in all books of Ahadith. It says that a party of the noble Companions ؓ was in travel. In a village on their way, a scorpion had bitten the chief. The village people asked the Companions if they could suggest some treatment for it. They recited the Surah al-Fatihah seven times, blew their breath on him and the ailing patient stood cured. Later, when this incident was mentioned before the Holy Prophet ﷺ ، he declared this action of the Companions to be permissible.

Similarly, there are several other Hadith reports which prove that the Holy Prophet ﷺ has done it himself. After having recited the last two verses of the Qur'an, he would blow his breath on the sick person. It is also proved that the Sahabah and the Tabi` in used to treat sick people with the recital of the last two verses of the Qur’ an as well as with the recital of other verses from it. That it was written and placed around the neck as an amulet also stands proved. Al-Qurtubi has given details about it under his commentary on this verse.