Abu Ahmad al-Hakim: He is said to have been a Companion, but I do not consider it sound.
Abu Hatim ibn Hibban al-Busti: He was a worshipping warrior, one of the leaders of the people of the Levant.
Abu Nu'aym al-Isbahani: He met [the Prophet] but did not see him, and it is not sound that he was a Companion.
Abd al-Rahman ibn Muhammad al-Dhahabi: He met the Prophet, peace and blessings be upon him, but it is not sound that he was a Companion.
Muhammad ibn Isma'il al-Bukhari: He did not mention any criticism or praise of him.
Muslim ibn al-Hajjaj al-Naysaburi: He was a Companion.