(640) بَابُ الْغَضَبِ
Ibn 'Umar said, "There is nothing that is swallowed greater withAllah in reward than a slave of Allah who swallows and contains his rancourout of desire for the pleasure of Allah."
Reference: Al-Adab Al-Mufrad 1318
In-book reference: Book 57, Hadith 2
English translation: Book 57, Hadith 1318