'The Pure Religion or Guiding People to the Religion of Truth', 9 volumes in an excellent 4 book set. By Mahmud Khattab a-Subki, with editing of Shaykh al-Sayed Amin Mahmud Khattab. The author aims to demonstrate the unification of God and worship of him in the correct way as stated in the Qur'an and sunnah, and the rejection of heresies and delusions that contradict but somehow worked into the religion.