Abu Hatim al-Razi: He spoke highly of him
Abu Dawud al-Sijistani: I have not seen anyone more knowledgeable about the lives of the ascetics than him
Ibn Hajar al-'Asqalani: Trustworthy Ascetic
Al-Junayd ibn Muhammad al-Sufi: The Delight of Syria
Mahmud ibn Khalid: I do not think there is anyone left on the face of the earth like him
Muslim ibn al-Qasim al-Andalusi: Trustworthy
Yahya ibn Ma'in: The people of Syria rain with him