Abū’l-Ḥasan Muḥammad b. ʿAmrū b. ʿAlī b. ʿAbd Allāh al-Baṣrī narrated to us, saying that Abū ʿAmrū Muḥammad b. Khālid [or Jābir] al-Bukhārī narrated to him among others, saying that Abū Sahl Muḥammad b. ʿAbd Allāh b. Sahl al-Muṭawʿī narrated to him among others, saying that Sufyān b. ʿAbd al-Ḥakīm narrated to him among others, saying that Yaḥyā b. ʿAbd Allāh al-Salamī informed him, saying that ʿAbd Allāh b. al-Mubārak narrated to him among others, saying that Yaḥyā b. Ayyūb narrated to him among others, saying that ʿAbd Allāh b. Qurayṭ narrated to him among others, from ʿAṭā b. Yasār, from Abī Saʿīd al-Khudrī, who narrates: “I have heard the Messenger of Allāh صلى الله عليه وعلى آله saying: “Whoever fasts in the month of Ramaḍān, having recognised its parameters—and maintains them as he should—then he has sufficiently expiated for whatever came before.”