Hadith 16 of an-Nawawi is about controlling anger. The Hadith says: 'I asked the Messenger of Allah: Who is the best among the people? He replied, 'The one who, when you look at him, you remember Allah.' Then I asked: Then who? He replied, 'The one who does not harm the Muslims with his tongue and hands.' Then I asked: Then who? He replied, 'The one who controls his anger.'