On his death bed Umar nominated Sa'ad b Abi Waqas as a member of the Committee who were to choose the next Caliph from among themselves. He also left instructions that in case Sa'ad b Abi Waqas was not chosen as the Caliph, he who was chosen as the Caliph should duly compensate Sa'ad b Abi Waqas for his services to Islam. He declared that in 640 C.E. he had deposed Sa'ad from the Governorship of Kufa merely by way of policy and not for any of his faults After the deposition of Sa'ad, Ammar b Yasir was appointed as the Governor of Kufa. He held the office for a short time, and was replaced by Mugheera b Shu'ba as the Governor of Kufa.