 Complete the following phrase:  He had spent considerable time in Egypt and was part of the delegation that complained about the activities of the governor of Egypt to the third Caliph Uthman ibn Affan. The Caliph promised to immediately dismiss the Egyptian governor and replace him with Muhammad ibn Abu Bakr. However, after sensing betrayal from Uthman ibn Affan but actually perpetrated by Marwan ibn al-Hakam against the Muslim petitioners from Egypt, Muhammad ibn Abu Bakr rushed back with the petitioners to Madinah where he initially took part in the uprising against Uthman ibn Affan. After realizing his error in getting involved in the 