Sufyan al-Thawri (Rahimahullah) (d. 161 AH) narrates concerning his teacher, Amr bin Qays (Rahimahullah) (d. 140 AH):

"He is the one who nurtured me: I learned the Quran from him, and he also taught me the knowledge of inheritance (Ilm-ul-Meeraath). I used to search for him in the market; if I couldn't find him there, I would find him at his home. At home, he would either be praying or busy reciting from the Mus-haf (Quran), as if he were making up for a lot that had been missed. If I did not find him at home either, I would find him in the corner of some mosque in Kufa, weeping so bitterly as if a thief were crying while begging his master for forgiveness. If he wasn't there either, he would be found somewhere in the graveyard, weeping and lamenting."

• Hilyat al-Awliya wa Tabaqat al-Asfiya (5/100)