Al-Isra · 17:82

82. And I reveal in the Qur’ān that which cures the hearts of ignorance, disbelief and doubt, cures the bodies when treated through it, and that which is a mercy for the believers who practice it. And this Qur’ān only increases the disbelievers in destruction, as listening to it angers them and makes them deny and turn away from it even more.