Abu Hatim al-Razi: He was a Companion
Abu Hatim ibn Hibban al-Busti: He met the Prophet (peace and blessings of Allah be upon him) and embraced Islam
Ibn Hajar al-'Asqalani: Companion who witnessed the pledge of allegiance at al-Ridwan
al-Dhahabi: He prayed towards the two qiblas
al-Mizzi: He was a Companion
Muhammad ibn Isma'il al-Bukhari: He was a Companion