Ibn Asakir reported: Al-Fudayl ibn ‘Iyad, may Allah have mercy on him, said, “Whoever has bad character has dishonored his religion, his reputation, and his manhood.”
Source: Tārīkh Dimashq 48/414
عن ابن عساكر قَالَ الْفُضَيْل بن عياض رحمه الله مَنْ سَاءَ خُلُقُهُ شَانَ دِينَهُ وَحَسَبَهُ وَمُرُوءَتَهُ
48/414 تاريخ دمشق لابن عساكر