Quran , chapter 41

Fussilat - Verse 34-35
{
And not equal are the good deed and the bad. Repel [evil] by that [deed] which is better; and thereupon the one whom between you and him is enmity [will become] as though he was a devoted friend.
But none is granted it except those who are patient, and none is granted it except one having a great portion [of good].

}