Al-Adab Al-Mufrad, Hadith 1318 ⓘ
Ibn 'Umar said, "There is nothing that is swallowed greater with Allah in reward than a slave of Allah who swallows and contains his rancour out of desire for the pleasure of Allah."
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، قَالَ: حَدَّثَنَا أَبُو شِهَابٍ عَبْدُ رَبِّهِ، عَنْ يُونُسَ، عَنِ الْحَسَنِ، عَنِ ابْنِ عُمَرَ قَالَ: مَا مِنْ جَرْعَةٍ أَعْظَمَ عِنْدَ اللهِ أَجْرًا مِنْ جَرْعَةِ غَيْظٍ كَظَمَهَا عَبْدٌ ابْتِغَاءَ وَجْهِ اللهِ.
also referenced under: Book 57, Hadith 2 (In-Book) & Book 57, Hadith 1318 (English)