Nahj al-Balāgha
Hadith 31ومن خطبة له (عليه السلام) بعد انصرافه من صفين وفيها حال الناس قبل البعثة وصفة آل النبي ثمّ صفة قوم آخرين
One of his (a.s) sermons, delivered after his departure from Ṣiffin, in which he describes the state of the people before the Proclamation of the Prophet (sw), the characteristics of the family of the Prophet, and then the characteristics of another group of people.