ʿAbd Allah ibn Salamah al-Muradi, Abu Ishaq, Muslim Abu Ḥassān al-Aʿraj, and others.
Al-Shaʿbi said, “In the business of judging, ʿUbaydah was the peer of Shurayḥ.” (1)
Ibn Sīrīn stated, “I have never seen anyone more cautious than ʿUbaydah.”
Muḥammad ibn Sīrīn reported extensively from him.
Aḥmad al-ʿIjli said, “ʿUbaydah was one of ʿAbd Allah ibn Masʿūd’s companions who taught the Quran and issued fatwas, and he was blind in one eye.”
I read to Aḥmad ibn Ibrāhīm al-Khaṭīb in the year 700 AH: Abu al-Ḥasan al-Sakhāwī informed us; Abu Ṭāhir al-Salafī informed us; al-Mubārak ibn ʿAbd al-Jabbār informed us; Muḥammad ibn Muḥammad al-Sawwaq informed us; ʿĪsā ibn Ḥāmid ar-Rukhkhajī narrated to us, saying: Haytham ibn Khalaf narrated to us; Aḥmad ibn Ibrāhīm narrated to us; Muʿādh narrated to us, from Hishām, from Ibn Sīrīn, from ʿUbaydah, who said:
“I prayed two years before the Prophet’s death—peace and blessings be upon him—and yet I never saw him.” (2)
Abu ʿAmr ibn al-Ṣalāḥ (3) said: “We have transmitted from ʿAmr ibn ʿAlī al-Fallas that he said, ‘The soundest of all chains is: Ibn Sīrīn → ʿUbaydah → ʿAlī.’”
I say: For all its strength, this isnad does not outstrip “Ibrāhīm → ʿAlqamah → ʿAbd Allah,” nor “al-Zuhri → Sālim → his father.” (4)
Furthermore, many hadiths with those two chains appear in the authentic collections, whereas that first chain does not; in the two Ṣaḥīḥs there is only a single hadith of ʿUbaydah from ʿAlī.