He narrated from al-Ḥasan al-Baṣrī, Abū ʿImrān al-Jawni, ʿAmr ibn Dīnār, Qatādah, Yaḥyā ibn Abī Kathīr, and Budayl ibn Maysarah.

Those who transmitted from him include Abū Dāwūd, Muslim ibn Ibrāhīm, Ḥabbān ibn Hilāl, Sahl ibn Bakkār, ʿAffān ibn Muslim, Mūsā ibn Ismāʿīl al-Tabūdhakī, Shaybān ibn Farrūkh, Hudbah ibn Khālid, and many others.

Aḥmad ibn Ḥanbal said, “He was firm with respect to all his teachers.”

Yaḥyā ibn Maʿīn, Aḥmad al-ʿIjli, and al-Nasāʾī likewise declared, “He was trustworthy.” Al-ʿIjli added, “He inclined to qadar (the free-will doctrine).”

Aḥmad ibn Zuhayr reported that Yaḥyā ibn Maʿīn was asked about Abān and Hammām. He replied, “Yaḥyā al-Qaṭṭān used to narrate from Abān and preferred him to Hammām, whereas I myself prefer Hammām.”

As for Muḥammad ibn Yūnus al-Kudaymī, he related—on the authority of ʿAlī ibn al-Madīnī, from Yaḥyā ibn Saʿīd—that the latter had rated Abān as weak and said, “I will not transmit ⦗1⦘ from him.”

If this report is sound, then at first he did refrain from narrating from him, but later on he did so after his judgment changed.

Indeed, ʿAbbās al-Dūrī transmitted from Yaḥyā ibn Maʿīn that he said, “Yaḥyā ibn Saʿīd died while he was still narrating from Abān ibn Yazīd.”

Abū Ḥātim said, “His ḥadīth is sound.”

Abū Aḥmad ibn ʿAdī mentioned him, saying, “He is steady; his narrations are to be recorded.”

I say: the man is reliable, a definitive authority. Both authors of the Ṣaḥīḥ relied upon him, and I have not come across