Show forgiveness (7:199)

[خُذِ الْعَفْوَ وَأْمُرْ بِالْعُرْفِ وَأَعْرِض عَنِ الْجَـهِلِينَ ]

(Show forgiveness, enjoin Al-`Urf (what is good), and turn away from the foolish) to His Prophet, the Messenger of Allah asked,

«مَا هَذَا يَا جِبْرِيل»

What does it mean, O Jibril?" Jibril said, `Allah commands you to forgive those who wronged you, give to those who deprived you, and keep relations with those who cut theirs with you.”’

Al-Bukhari said, “Allah said,

[خُذِ الْعَفْوَ وَأْمُرْ بِالْعُرْفِ وَأَعْرِض عَنِ الْجَـهِلِينَ ]

(Show forgiveness, enjoin Al-`Urf and turn away from the ignorant). `Al-`Urf’, means, righteousness.”
Al-Bukhari next recorded from Ibn `Abbas that he said, “`Uyaynah bin Hisn bin Hudhayfah stayed with his nephew Al-Hur bin Qays, who was among the people whom `Umar used to have near him, for `Umar used to like to have the reciters of the Qur’an (who memorized it) near him and would listen to their opinion, regardless of whether they were old or young men. `Uyaynah said to his nephew, `O my nephew! You are close to this chief (`Umar), so ask for permission for me to see him.’ Al-Hur said `I will ask him for you,’ and he asked `Umar for permission for `Uyaynah to meet him, and `Umar gave him permission. When `Uyaynah entered on `Umar, he said, `O Ibn Al-Khattab! You neither give to us sufficiently nor rule with justice between us.’ `Umar became so angry that he almost punished `Uyaynah. However, Al-Hur said, `O Chief of he Faithful! Allah, the Exalted, said to His Prophet ,

 [خُذِ الْعَفْوَ وَأْمُرْ بِالْعُرْفِ وَأَعْرِض عَنِ الْجَـهِلِينَ ]

(Show forgiveness, enjoin Al-`Urf, and turn away from the foolish) Verily this man (`Uyaynah) is one of the fools!‘ By Allah, `Umar did not do anything after he heard that Ayah being recited, and indeed, he was one who adhered to the Book of Allah, the Exalted and Most Honored.”
Al-Bukhari recorded this Hadith.

Some scholars said that people are of two kinds, a good-doer, so accept his good doing and neither ask him more than he can bear nor what causes him hardship. The other kind is the one who falls in shortcomings, so enjoin righteousness on him. If he still insists on evil, becomes difficult and continues in his ignorance, then turn away from him, so that your ignoring him might avert his evilness.
 
Allah said in other instances,

[ادْفَعْ بِالَّتِى هِىَ أَحْسَنُ السَّيِّئَةَ نَحْنُ أَعْلَمُ بِمَا يَصِفُونَ - وَقُلْ رَّبِّ أَعُوذُ بِكَ مِنْ هَمَزَاتِ الشَّيـطِينِ - وَأَعُوذُ بِكَ رَبِّ أَن يَحْضُرُونِ ]

(Repel evil with that which is better. We are best-acquainted with the things they utter. And say: “My Lord! I seek refuge with You from the whisperings (suggestions) of the Shayatin (devils). And I seek refuge with You, My Lord! lest they should come near me.”)[23:96-98]

and,

[وَلاَ تَسْتَوِى الْحَسَنَةُ وَلاَ السَّيِّئَةُ ادْفَعْ بِالَّتِى هِىَ أَحْسَنُ فَإِذَا الَّذِى بَيْنَكَ وَبَيْنَهُ عَدَاوَةٌ كَأَنَّهُ وَلِىٌّ حَمِيمٌ - وَمَا يُلَقَّاهَا إِلاَّ الَّذِينَ صَبَرُواْ وَمَا يُلَقَّاهَآ إِلاَّ ذُو حَظِّ عَظِيمٍ ]

 
(The good deed and the evil deed cannot be equal. Repel (the evil) with one which is better, then verily he, between whom and you there was enmity, (will become) as though he was a close friend. But none is granted it (the above quality) except those who are patient — and none is granted it except the owner of the great portion in this world.) [41:34-35]