Abu Hatim ibn Hibban al-Busti: He mentioned him among the trustworthy
Abu Zar'ah al-Razi: He is, in our opinion, an Imam, and once: Trustworthy
Abu Shuja' Shirwayh al-Daylami: The righteous man, one of the narrators of Kufa
Ibn Hajar al-Asqalani: Trustworthy
Al-Hasan ibn Yazid al-Khashab: If Muhammad ibn Ubayd had been in Baghdad, he would have been similar to Ahmad ibn Hanbal
Al-Dhahabi: Righteous
Muhammad ibn al-Hasan ibn al-Faraj: I arrived in Baghdad and the scholars of Hadith gathered around me, so I presented to them the Hadith of my Sheikhs, and they said: We want the Hadith of Muhammad ibn Ubayd