Anger Comes From Devil
Anger comes from shaitan and anger leads to frustration hence utmost care is to be taken if we tend to become angry. In anger a person tends to lose all his senses and it may go in any way. Sometimes anger ends in horrible violence as a question becomes of our ego. People think of not giving up at any cause to look down or to compromise themselves. The devil that is shaytan sows more seeds of division and frustration among the people or a group where anger has taken place. Hence be cautious whenever you get angry. Differences are bound to happen. Many a times two people become angry for some minor issues and it happens when someone is abused, tortured or insulted in public or personal. Sometimes the language used by a person is such that also makes a person angry. If respect and honour is not given that also may be the cause. Hence never get angry as anger is provoked and guided by shaytan, he teaches and guides various methods how to lose our patience and have quarrels, conflicts and fights among each other.

Here are few Hadith related with anger

Allah says: ".who repress anger, and who pardon men; verily, Allah loves Al-Muhsinoon (the good-doers)." [Aal 'Imraan 3:134]
The Prophet (Peace And Blessings Upon Him) often advised people not to get angry. Al-Bukhaari narrated in al-Saheeh (6116) from Abu Hurayrah (RadiAllaho Talaanho) that a man said to the Prophet (Peace And Blessings Upon Him), "Advise me." He said: "Do not get angry." The man repeated his request several times, and he said, "Do not get angry."
The Prophet (Peace And Blessings Upon Him) regarded the one who controls himself when he is angry as being the strongest of men. Al-Bukhaari narrated in al-Saheeh (6114) that the Messenger of Allah (saws) said: "The strong man is not the one who can wrestle (fight); the strong man is the one who controls himself at the time of anger."
The Prophet (sal-Allaahu 'alayhe wa sallam) said: "If a man gets angry and says, 'I seek refuge with Allah,' his anger will go away." [Saheeh al-Jaami' as-Sagheer, no. 695]

The Messenger of Allaah (sal-Allaahu 'alayhe wa sallam) said: "If any of you becomes angry, let him keep silent." [Reported by Imaam Ahmad, al-Musnad, 1/329; see also Saheeh al-Jaami', 693, 4027]
May Allah Rabbul Izzat give us hidayat not to get angry and be calm and peaceful all the time Ameen

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A teacher by profession