The Quran and Sunnah (Traditions of the Prophet) explicitly dictate regulations and rights for the protection of non-Muslim minorities living under the rule of Islam. The Prophet even said that if a Muslim hurts a covenanted person (i.e. a non-Muslim living under the rule of Islam) or commits any injustice to him, then on the Day of Judgment the Prophet (pbuh) would be the advocate on behalf of the non-Muslim against the Muslim. What would be the sense and need for all of these prescriptions and advice, if Islam required that they be compelled to accept the religion?
