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.( سورة فصلت , Fussilat, Chapter #41, Verse #36)
The beat commentary of this subject is the event which Imam Ahmad has related in his Musnad on the authority of Hadrat Abu Hurairah. He says that once a man started uttering invectives against Hadrat Abu Bakr, in the presence of the Holy Prophet. Hadrat Abu Bakr kept on hearing the invectives quietly and the Holy Prophet kept on smiling at it. At last, when Hadrat Abu Bakr could restrain himself no longer, he also uttered a harsh word for the person in response. No sooner did he utter the word than the Holy Prophet was seized by restraint, which appeared on his face, and he rose and left the place immediately. Hadrat Abu Bakr also rose and went behind him. On the way he asked, 'How is it that as long as the person went on abusing me, you kept quiet and smiling, but when I also said a word in retaliation, you were annoyed" The Holy Prophet replied, "Until you were quiet an angel remained with you, who went on replying to him on your behalf, but when you spoke out Satan came in place of the angel: I could not sit with Satan. "
Satan feels grieved when he sees that in the conflict between the Truth and falsehood, meanness is being resisted with nobility and evil with goodness. He wants that he should somehow incite the fighters for the sake of the Truth and their prominent men in particular, and especially their leaders, to commit such a mistake, even if once, on the basis of which he may tell the common people that evil is not being committed by one side only: if mean acts are being committed by one side, the people of the other side also are not morally any better: they too have committed such and such a shameless act.
The common people do not have the capability that they may assess and counterbalance fairly the excesses being committed by one party by the reactions of the other. As long as they see that while the opponents are adopting every mean act yet these people do not swerve at all from the path of decency and nobility, goodness and righteousness, they continue to regard and esteem them highly. But if at some time they happen to commit an unworthy act, even if it is in retaliation against a grave injustice, both the sides become equal in their esteem, and the opponents also get an excuse to counter one blamable act with a thousand abuses.
That is why it has been said: 'Be on your guard against the deceptions of Satan. He will incite you as a well wisher to take note of every abuse and every insult and attack and urge you to pay the opponent in the same coin, otherwise you would be regarded as a coward and weaken your image of strength."
On every such occasion whenever you feel any undue provocation, you should take care that this is an incitement of Satan who is arousing you to anger and wants you to commit a mistake. And after having been warned do not be involved in the misunderstanding that you have full control over yourself, and Satan cannot make you commit any mistake. This high opinion of ones own power of judgment and will is another and more dangerous deception of Satan. Instead of it you should seek Allah's refuge, for man can save himself from mistakes only if Allah helps and grants him protection.
Taken from Sayyid Abul Ala Maududi - Tafhim al-Qur'an - The Meaning of the Qur'an (http://searchtruth.com/tafsir/tafsir.php?chapter=41)