Ibn Abi Hatim al-Razi: He did not accompany the Prophet
Al-Dhahabi: Trustworthy, well-known
Muhammad ibn Sa'd, author of al-Waqidi: Trustworthy, narrated many hadiths
Authors of Tahrir Taqrib al-Tahdhib: His companionship is not established, the two Sheikhs narrated from him in their Sahihs