Abu al-Faraj ibn al-Jawzi: He was one of the famous for his knowledge of Sunnah and religion, and his trustworthiness
Abu Sa'd al-Sam'ani: He was one of the trustworthy narrators famous for his knowledge of Sunnah
Ahmad ibn Hanbal: Trustworthy, and once said: I have not seen anyone, despite his young age and limited knowledge, more upright in the matters of Allah than him
al-Khatib al-Baghdadi: One of the famous for his knowledge of Sunnah, and narrated a few hadiths
Khalil ibn Aibak al-Safadi: A knowledgeable, ascetic, pious scholar, famous for his knowledge of Sunnah, religion and trustworthiness