1519 – ʿAbd Allah narrated to us; Nasr ibn ʿAli narrated to us; Muslim ibn Qutaybah informed me; Sahl al-Sarraj narrated, from al-Hasan, regarding the verse, “And devote yourself to Him with complete devotion” (al-Muzzammil 8). He said: “Purify your worship for Him with absolute sincerity.”