Abu Hatim al-Razi: He narrated a Munkar Hadith from Salim, on the authority of Ibn Umar, and he was a righteous man from amongst the worshippers
Abu Hatim ibn Hibban al-Busti: He mentioned him in al-Thiqat and said: He was one of the worshipping ascetics and the strivers who renounced worldly desires for worship
Abu 'Abd Allah al-Hakim al-Naysaburi: Trustworthy, reliable
Abu Yu'la al-Khalili: I have not seen the righteous lie more than them in Hadith
Ahmad ibn Salih al-Jili: Trustworthy, a righteous man
Ibn Hajar al-'Asqalani: Trustworthy worshipper, with many merits
al-Daraqutni: Trustworthy, but he was afflicted with weak narrators
al-Dhahabi: Trustworthy, of great importance, and he said in al-Tadhhib: The ascetic, one of the flags
Sulayman ibn Tarkhan al-Taymi: There is no one I would rather meet Allah with a record like his except Muhammad ibn Wasi
Musa ibn Harun al-Hammal: Trustworthy, scholar, gathered goodness