Mustadrak al-Hakim — Hadith 6062

It is narrated from Mus'ab bin Abdullah al-Zubayri that Sayyiduna Abu Ayyub Khalid bin Zayd bin Kulayb bin Tha'labah bin Abd Awf, who belonged to Banu Tamim bin Malik bin al-Najjar, took part in the Pledge of al-Aqabah, the Battle of Badr, all the campaigns, and the conquests of Iraq. He was also present with Sayyiduna Ali (may Allah be pleased with him) at the Battle of Siffin. Then he went to Syria, entered the land of the Romans as a warrior, and stayed at Constantinople.