Abu Bishr al-Dawlabi: Trustworthy
Abu Hatim ibn Hibban al-Busti: He was a man of hadith and Sunnah
Ahmad ibn Shuayb al-Nasai: Trustworthy
Ibn Hajar al-Asqalani: Trustworthy
Al-Dhahabi: An Imam, firm, and once said: He was a حافظ (memorizer) and a رحال (traveler for knowledge)
Abbas ibn Abd al-Azim al-Anbari: I saw three whom I made witnesses between myself and Allah: Ahmad ibn Hanbal, Zayd ibn al-Mubarak, and Sadaqah ibn al-Fadl