Consider thou and call to mind the time when Muhammad appeared. He said, and His word is the truth: 'Pilgrimage to the House [Mecca] is a service due to God.' [Qur'án 3:91] And likewise are the daily prayer, fasting, and the laws which shone forth above the horizon of the Book of God, the Lord of the World and the true Educator of the peoples and kindreds of the earth. It is incumbent upon everyone to obey Him in whatsoever God hath ordained; and whosoever denieth Him hath disbelieved in God, in His verses, in His Messengers and in His Books. (Baha'u'llah, Tablets of Baha'u'llah revealed after the Kitab-i-Aqdas)