Hazrat Abu Ubaidah Ibn Al Jarrah (RA) was one of the top ten companions of the Prophet Muhammad (SAWS). He was very faithful to the Prophet and his religion.
He remained as the commander of a large section of Rashidun army during the time of Umar (RA). He was also on the list of Umar's appointed successors to the Caliphate. He belonged to the Quraishi clan and converted to Islam in his youth.