I wanted to know is there any dua to control the anger of a person. I have a friend who loses his temper on petty issues and regret for it later. I want to help him. Please suggest me what can be done to make him control his anger?

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Hadith states that one who is anger if he is standing should sit down and if he is sitting then lie down.

Also to drink water.

Try to refrain from such situations which make one angry. If one realises that they are in such a situation to walk away from it.