مَن جَآءَ بِٱلْحَسَنَةِ فَلَهُۥ عَشْرُ أَمْثَالِهَا ۖ وَمَن جَآءَ بِٱلسَّيِّئَةِ فَلَا يُجْزَىٰٓ إِلَّا مِثْلَهَا وَهُمْ لَا يُظْلَمُونَ Qur’an Al-An'am (6:160)Man j a a bi a l h asanati falahu AAashru amth a lih a waman j a a bi al ssayyi a ti fal a yujz a ill a mithlah a wahum l a yu th lamoon a
Lit., "and they shall not be wronged". See in this connection the statement that God "has willed upon Himself the law of grace and mercy", occurring in verse {12} of this surah, and the corresponding note [10].
God is just as well as generous. To the good the reward is multiplied ten times (i.e., far above the merits) on account of His generosity. To the evil, the punishment is no more than commensurate with their sin, and even so the door of mercy is always open to those who sincerely repent and show it by their conduct.