I passed by Abu Hurairah while he was performing ablution, and he said, "Do you know why I am performing ablution? Because of pieces of dried curd I ate. I heard the Messenger of Allah ﷺ say, 'Perform ablution after eating anything touched by fire.'"
حدثنا عبد الرزاق حدثنا معمر عن الزهري عن عمر بن عبد العزيز
مررت بأبي هريرة وهو يتوضأ فقال أتدري مما أتوضأ من أثوار أقط أكلتها إني سمعت رسول الله ﷺ يقول توضئوا مما مست النار
Its isnad is sahih. Ibrahim bin Abdullah bin Qariz is a trustworthy successor (tabii), as was explained in detail previously under 1659 and 7409, regarding the difference between him and his father, that they are two separate people, and that whoever treats them as a single narrator due to uncertainty about his name has erred.Nasai related the hadith in 1:390, through the route of Ibn Ulaya and Abdul-Razzaq, both from Maamar, from Zuhri, with this same isnad, but he confined it there to only the part traced directly back to the Prophet. He then related it at greater length, similar to what is here, through the route of Bakr bin Sawada, from Zuhri, with this same isnad, but he named the successor as Abdullah bin Ibrahim bin Qariz.Muslim likewise related it in 1:107 at length, as one of three hadiths, this being one of them, through the route of Aqeel bin Khalid, from Zuhri, and he named the successor Abdullah. From this it also becomes clear to us that Ibn Main was correct in what we quoted from him in the commentary on 1659, that Zuhri used to make mistakes regarding this. Whatever the case may be, the hadith is sahih. See also 3494 and 2793, and see also al-Muntaqa 342.As for his saying, "some pieces of dried curd," al-aqit, with a fatha on the hamza and a kasra on the qaf, is dried, hardened milk that is cooked with. And al-athwar is the plural of thawr, with a fatha on the thaa, meaning a piece of it.