Qur'an, Fussilat, Surah 41: 34-36
Nor can goodness and Evil be equal. Repel (Evil) with what is better: Then will he between whom and thee was hatred become as it were thy friend and intimate! And no one will be granted such goodness except those who exercise patience and self-restraint, none but persons of the greatest good fortune.
And if (at any time) an incitement to discord is made to thee by the Evil One, seek refuge in Allah. He is the One Who hears and knows all things.