Fudayl on Mercy: Whoever forgives others has defeated Satan

Abu Razin reported: A man came to Al-Fudayl ibn Bazwan, may Allah have mercy on him, and he said, “Indeed, a man has slandered you!” Al-Fudayl said, “Verily, I will infuriate the one who commanded him! May Allah forgive me and forgive him.” It was said, “Who has commanded him?” Al-Fudayl said, “Satan.” Ibn Farafisah said, “Whoever seeks forgiveness for his oppressor has defeated Satan.”

Source: al-Zuhd wal-Raqā’iq 656

عَنْ أَبِي رَزِينٍ قَالَ جَاءَ رَجُلٌ إِلَى الْفُضَيْلِ بْنِ بَزْوَانَ رحمه الله فَقَالَ إِنَّ فُلانًا يَقَعُ فِيكَ فَقَالَ لِأُغِيظَنَّ مَنْ أَمَرَهُ يَغْفِرُ اللَّهُ لِي وَلَهُ قِيلَ مَنْ أَمَرَهُ قَالَ الشَّيْطَانُ وقال بن فرافصة وَمَنِ اسْتَغْفَرَ لِظَالِمِهِ فَقَدْ هَزَمَ الشَّيْطَانَ

656 الزهد والرقائق لابن المبارك باب ما جاء في الشح