It is narrated from Mus'ab bin Abdullah al-Zubayri that Sayyiduna Khuzaymah bin Thabit bin al-Fakih bin Tha'labah bin Sa'idah bin Amir bin Anan bin Amir bin Khatmah (may Allah be pleased with him) is the one who is called "Dhu al-Shahadatayn". The Messenger of Allah (peace and blessings be upon him) made his testimony alone equal to the testimony of two men. He informed the Prophet (peace and blessings be upon him) that he had seen in a dream as though he were prostrating on the forehead of the Prophet (peace and blessings be upon him). So the Prophet (peace and blessings be upon him) lay down (to fulfil his dream) until he prostrated on his (peace and blessings be upon him) forehead. He was martyred at the Battle of Siffin after the martyrdom of Sayyiduna Ammar bin Yasir (may Allah be pleased with him).

It is narrated from Muhammad bin Ishaq that Dhu al-Shahadatayn, Sayyiduna Khuzaymah bin Thabit (may Allah be pleased with him), took part in the Battle of Siffin alongside Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) and was martyred that very day, in the year 37 AH. Sayyiduna Khuzaymah (may Allah be pleased with him) had two brothers, one of whom was named Wahwah and the other Abdullah.

Muhammad bin Umarah bin Khuzaymah bin Thabit narrates from his grandfather that my grandfather held back his weapons on the day of the Battle of the Camel and the day of the Battle of Siffin until Sayyiduna Ammar (may Allah be pleased with him) was martyred. So when Ammar (may Allah be pleased with him) was martyred, he said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Ammar will be killed by a rebellious group." The narrator says: Then he drew his sword and fought until he was martyred.