Quran 28:84

مَن جَآءَ بِٱلۡحَسَنَةِ فَلَهُ ۥ خَيۡرٌ۬ مِّنۡہَا‌ۖ وَمَن جَآءَ بِٱلسَّيِّئَةِ فَلَا يُجۡزَى ٱلَّذِينَ عَمِلُواْ ٱلسَّيِّـَٔاتِ إِلَّا مَا كَانُواْ يَعۡمَلُونَ ٨٤

Whoever works righteousness receives a far better reward. As for those who commit sins, the retribution for their sins is precisely equivalent to their works.