Ḥanbal, Abū Bakr ibn Abī Shaybah, Zuhayr ibn Ḥarb, Muḥammad ibn ʿAbd Allāh ibn Numayr, al-Ḥasan ibn ʿArafah, Abū Isḥāq al-Jawzajānī, Aḥmad ibn ʿUbayd Allāh al-Narsī, Aḥmad ibn ʿUbayd ibn Nāṣiḥ, Aḥmad ibn al-Walīd al-Faḥḥām, Isḥāq al-Kawsaj, al-Ḥasan ibn ʿAlī al-Khallāl, al-Zaʿfarānī, Salamah ibn Shabīb, Sulaymān ibn Sayf al-Ḥarrānī, ʿAbbās al-Dūrī, ʿAbd Allāh ibn Munayr, Muḥammad ibn Aḥmad ibn Abī al-ʿAwwām, ʿAbdu ibn Ḥumayd, ʿAbd Allāh al-Dārimī, Aḥmad ibn al-Furāt, Aḥmad ibn Sinān, Aḥmad ibn Sulaymān al-Ruhāwī, Abū Qilābah al-Raqāshī, Muḥammad ibn ʿAbd al-Malik al-Daqīqī, Yaʿqūb al-Dawraqī, al-Ḥasan ibn Mukram, al-Ḥārith ibn Abī Usāmah, Muḥammad ibn Maslamah al-Wāsiṭī, Muḥammad ibn Ribḥ al-Bazzāz, Idrīs ibn Jaʿfar al-ʿAṭṭār, and Aḥmad ibn ʿAbd al-Raḥmān al-Saqaṭī—the last person to transmit from him.
It is said that his lineage goes back to Bukhara.
ʿAlī ibn al-Madīnī remarked, “I have never seen anyone with a better memory than Yazīd ibn Hārūn.” (1)
Yaḥyā ibn Yaḥyā al-Tamīmī said, “His memory surpasses that of Wakīʿ.”
Aḥmad ibn Ḥanbal stated, “Yazīd was a ḥāfiẓ, exact in his transmission.”
Ziyād ibn Ayyūb observed, “I never saw Yazīd with a book at all; he related to us purely from memory.” (2)
ʿAlī ibn Shuʿayb reported: “I heard Yazīd ibn Hārūn say:
‘I have memorised twenty-four thousand hadith with their full chains of transmission—without boasting—and I retain for the Syrian narrators twenty thousand…’