 As a response, Muhammad sent 200 men, which included Abu Bakr and Umar, headed by Abu Ubaidah ibn al Jarrah.When Abu Ubaidah arrived he asked to be the Commander of the entire force, to which Amr refused, Abu Ubaidah accepted this and does not complaint since he has been warned before by the Islamic Prophet, Muhammad not to enter any conflict over leadership during this expedition.This instruction included the ruling of who should command the prayer according to Fiqh or Islamic jurisprudence regarding the leader of daily prayer during the time of war.