Abu Hatim al-Razi: He was a companion of the Prophet
Abu Hatim ibn Hibban al-Busti: The one about whom the Prophet (peace and blessings of Allah be upon him) said, when he entered upon him while he was sick, 'May Allah relieve Thaabit ibn Qays ibn Shammas
Ibn Hajar al-Asqalani: Sahabi
Jalal al-Din al-Suyuti: He witnessed Uhud and what came after it, and the Prophet (peace and blessings of Allah be upon him) testified that he was in Paradise and said, 'What a good man Thaabit is
Muhammad ibn Ismail al-Bukhari: He was a companion of the Prophet