After Muhammad [saw] had preached publicly for more than a decade, the opposition to him reached such a high pitch that, fearful for their safety, he sent some of his adherents to Ethiopia, where the Christian ruler extended protection to them, the memory of which has been cherished by Muslims ever since. But in Mecca the persecution worsened. Muhammad’s followers were harassed, abused, and even tortured. At last, therefore, Muhammad [saw] sent...