Abu al-'Abbas ibn 'Uqdah al-Kufi: Abu Kuraib is superior in memorization and abundance of narrations to all of their Shaykhs
Abu Hatim al-Razi: Truthful
Abu Hatim ibn Hibban al-Busti: He mentioned him among the trustworthy narrators
Abu 'Ali al-Hafiz al-Naysaburi: I heard Ibn 'Uqdah saying that Abu Kuraib is superior in memorization and abundance of narrations to all of their Shaykhs
Ahmad ibn Shu'ayb al-Nasa'i: Trustworthy, and once: He is fine
Ahmad ibn Nasr al-Khaffaf: I have not seen among the Shaykhs after Ishaq ibn Ibrahim someone with a better memory than Abu Kuraib
Ibrahim ibn Abi Talib al-Naysaburi: I have not seen after Ahmad ibn Hanbal someone with a better memory than Abu Kuraib
Ibn Hajar al-'Asqalani: Trustworthy Hadith Scholar
Al-Dhahabi: The Hadith Scholar, and once: One of the trustworthy narrators with abundant narrations
Hajjaj ibn al-Sha'ir al-Baghdadi: I heard Ahmad ibn Hanbal saying: 'If I were to narrate from someone among those who responded - meaning: in the tribulation - I would narrate from two: Abu Mu'mar, and Abu Kuraib'
Muhammad ibn 'Abdullah ibn Numayr: I do not know of any Hadith from our land from him
Muslim ibn al-Qasim al-Andalusi: Trustworthy