Abu Abd Allah al-Hakim al-Naysaburi: One of his time in memorization, piety, righteousness, travel, discussion, and classification
Al-Khatib al-Baghdadi: He was one of his time in memorization and piety
Al-Daraqutni: A righteous Imam, and once he said: A pious memorizer
Al-Dhahabi: The memorizer, the Imam, the scholar, the firm, one of the critics
Jalaluddin al-Suyuti: One of the prominent scholars of Hadith
Abd al-Rahman ibn Muhammad ibn Mandah al-Isbahani: I have not seen anyone who memorizes more than him