Abu Sa'd al-Sam'ani: A Hadith scholar of Nishapur in his time, he was a paragon of virtue
Abu Abd Allah al-Hakim al-Naysaburi: He was among the sheikhs of Nishapur, and he said: The truthful and trustworthy, and once: I accompanied him for twenty-two years, and I never knew that the angel wrote down a sin for him, there is no one among our companions who is more understanding or more trustworthy than him, and I nicknamed him 'Uthman for his trustworthiness
Abu Ali al-Hafiz al-Naysaburi: He is the most trustworthy of those who narrated from him
Al-Khatib al-Baghdadi: A righteous servant, trustworthy Hadith scholar, who compiled works on Hadith flaws, Sheikhs and Hadith chapters