One of the customs of the Ismailis of Tajik Badakhshan is the performance of a specific genre of religious poetry, called madah. In madah, literally meaning praise, the veneration of 'Ali, the holy family of the Prophet Muhammad, the Ismaili imams, and the 11th century Ismaili poet-philosopher, Nasir-i Khusraw, is expressed in combination with mystical ideas common in Sufi poetry.