It is God’s mercy that any good we do that God will reward us tenfold for those works, while any evil we commit we are only requited for just that.
6:160 Whoever does a righteous work receives the reward for ten, and the one who commits a sin is requited for only one. No one suffers the slightest injustice.
(١٦٠) مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا وَمَنْ جَاءَ بِالسَّيِّئَةِ فَلَا يُجْزَىٰ إِلَّا مِثْلَهَا وَهُمْ لَا يُظْلَمُونَ
7:147 Those who reject our revelations and the meeting of the Hereafter, their works are nullified. Are they requited only for what they committed?
(١٤٧) وَالَّذِينَ كَذَّبُوا بِآيَاتِنَا وَلِقَاءِ الْآخِرَةِ حَبِطَتْ أَعْمَالُهُمْ هَلْ يُجْزَوْنَ إِلَّا مَا كَانُوا يَعْمَلُونَ
37:39 You are requited only for what you have done.
(٣٩) وَمَا تُجْزَوْنَ إِلَّا مَا كُنْتُمْ تَعْمَلُونَ
66:7 O you who disbelieved, do not apologize today. You are being requited only for what you did.