Fussilat 41:34

Wala tastawee alhasanatu walaassayyi-atu idfaAA billatee hiya ahsanufa-itha allathee baynaka wabaynahu AAadawatunkaannahu waliyyun hameem

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.

Good and evil are not equal. Repel (evil) with what is best, and you will see that the one you had mutual enmity with him will turn as if he were a close friend.