Abdullah b. Umar, as one of the famous companions of the Prophet Muhammad in following his sunna and well-known with his pious character, also participated in the events which happened during the time of Four Caliphs. For instance, he took part in the Ridda Wars and other early Islamic conquests. Actually he preferred to be impartial and to be with the Muslim majority in order to prevent to cause any conflict and discrepancy in the Muslim society. With this distinguished character, he set up a good example as well