"he was a leader in grammar and Arabic, and narrated many ḥadīths. Ibrāhīm ibn Arūmah said: Yaḥyá was among the trustworthy, and mentioned that his birth was in the year sixty-five, during the caliphate of al-Mahdī. Among the good ḥadīths he narrated..." I said: Then he presented three ḥadīths for him, the first of which is this. As for Isḥāq ibn Muḥammad ibn Ḥakīm, he is Isḥāq ibn Muḥammad ibn Ibrāhīm ibn Ḥakīm. Abū al-Shaykh said (267): "A trustworthy shaykh from the people of literature and knowledge of ḥadīth, he possessed the books of Abū ʿUbaydah and ʿAbd al-Razzāq... and narrated many ḥadīths. He was truthful and trustworthy, and did not narrate except from his book. He died in the year three hundred and twelve." I said: It is astonishing that this ḥadīth was missed by al-Suyūṭī in "al-Jāmiʿ al-Kabīr" and he did not include it, while he mentioned it in "al-Jāmiʿ al-Ṣaghīr" from the narration of al-Daylamī from Ibn ʿUmar, as if he later included it there. However, he missed this high source, which is "Tārīkh Iṣbahān," as did its commentator al-Manāwī, who also said, explaining the isnād of al-Daylamī: "In it, there is someone unknown." I said: Either the isnād of al-Daylamī is different from the isnād of Abū al-Shaykh, or it is the same but some of its narrators were unknown to him because they were not translated in any source other than this "Tārīkh," which I consider more likely. And Allāh knows best. In summary, this ḥadīth is among the rare benefits that you do not find in any book with this isnād and verification. So all praise is due to Allāh, and He is the bestower of success