Qatadah (may Allah have mercy on him) said: Whoever sits for the Qur'an and then stands up, he will rise with either an increase or a loss. Then he recited this verse: «﴿وَنُنَزِّلُ مِنَ الْقُرْآنِ مَا هُوَ شِفَاءٌ وَرَحْمَةٌ لِلْمُؤْمِنِينَ وَلَا يَزِيدُ الظَّالِمِينَ إِلَّا خَسَارًا﴾» [الاسراء: 82/17] meaning, "This Qur'an which We are revealing is, for the believers, complete healing and mercy; but for the wrongdoers, it increases them in nothing but loss."