| He commanded the 's left wing at the | As news of the huge army Heraclius was assembling reached Abu Bakr, Abu Bakr then sent a letter to who was close to defeating the Persian Empire at Qadisiyah |
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| According to , the first Muslim historian on the events, Yazid was the first commander with 1000 horsemen sent to Syria and Palestine by | The possible route of any Muslim reinforcement was expected to be the conventional Syria-Arabia road in the south, but Khalid, who was then in Iraq, took the most unexpected route: marching through the waterless , to the surprise of the Byzantines, he appeared in northern Syria |
, , and were all Rashidun caliphs and relatives of even in-law , becoming them relatives of , Yazid and.
23| Al-Waqidi's account matches the Roman account of the events | Abu Bakr then sent Abu Ubaydah towards Syria, slowly encircling the Roman armies |
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| was his distant relative through his marriage to Ali's daughter, Umm Kulthoom, and his daughter, Hafsa's marriage to | In the meantime, Christian Arabs living in Medina gave intelligence to the Roman emperor, , about the impending invasion |
Translated by Mawlana Sulayman al-Kindi.