Ottoman officials later moved Baha’u’llah to the prison city of Akka in Palestine. He remained there until his passing in 1892. Today, Baha’u’llah’s shrine, now in Israel, is an important pilgrimage site. Baha’u’llah’s writings form the foundation of the Baha’i faith. Throughout his life, Bah’u’llah penned over 100 volumes in Arabic and Persian. About a dozen of these have been translated into English and other languages. His most well-known book is “The Hidden Words,” which is composed of short poetic statements that get to the heart of his spiritual and ethical teachings.