The letter summarizes the contents of a letter sent by the Prophet Muhammad to Hercules, the Byzantine emperor. It invites him to accept Islam so that he may be safe and rewarded by God. It also references a verse from the Quran calling people of previous scriptures to worship only God. An envoy was chosen to deliver the letter to the king of Busra to send to Hercules. When Abu Sufyan met Hercules, he questioned him about Muhammad and the new religion, and Abu Sufyan responded by acknowledging Muhammad's noble lineage and honesty, though he had not yet accepted Islam himself.