Tafsir of Al-Haqqah 69:48

And verily, this (Qur'an) is a Reminder for those who have Taqwa. meaning, the Qur'an. This is just as Allah says,

قل هو للذين ءامنوا هدى وشفاء والذين ﻻ يومنون فى ءاذانهم وقر وهو عليهم عمى

Say: "It is for those who believe, a guide and a healing. And as for those who disbelieve, there is heaviness (deafness) in their ears, and it (the Qur'an) is blindness for them.'' Then Allah says,

وإنا لنعلم أن منكم مكذبين