Ash-Shura - 42:40

وَجَزَاء سَيِّئَةٍ سَيِّئَةٌ مِّثْلُهَا فَمَنْ عَفَا وَأَصْلَحَ فَأَجْرُهُ عَلَى اللَّهِ إِنَّهُ لَا يُحِبُّ الظَّالِمِينَ
[42:40]
And the recompense of evil is punishment like it, but whoever forgives and amends, he shall have his reward from Allah; surely He does not love the unjust.
The recompense for an injury is an injury equal thereto (in degree): but if a person forgives and makes reconciliation, his reward is due from Allah: for (Allah) loveth not those who do wrong.
The guerdon of an ill-deed is an ill the like thereof. But whosoever pardoneth and amendeth, his wage is the affair of Allah. Lo! He loveth not wrong-doers.