Someone asked, "Messenger of Allah, what is fasting?"He replied, "An obligation that suffices."
حدثنا أبو كامل حدثنا حماد بن سلمة عن معبد بن هلال حدثني رجل في مسجد دمشق عن عوف بن مالك
يا رسول الله ما الصوم قال فرض مجزئ
No references are available.
Its chain of transmission is daif, due to the unknown identity of the man narrating from Awf. Haythami said the same, 2/181. It is found in Tabarani, 8/259, no. 7871.