As for the Usool, then indeed I have seen the people of bid’a, misguidance, and desires, like the Mutafalsifah (the people of philosophy) [4], the Baataniyyah [5] and the Malaahidah [6], and those who believe in Wahdatul-Wujood [7], the Dahriyyah [8], the Qadariyyah [9], the Nusayriyyah [10], the Jahmiyyah [11], the Hulooliyyah [12], the Mu’attilah [13], the Mujassimah [14], the Mushabbihah [15], the Raawindiyyah [16], the Kullaabiyyah [17], the Saalimiyyah [18], and other than them from ahlul-bid’a – creating a critical situation by (their) misguidance. And it is clear to me that many of them only intend the destruction of the pure and sacred Sharee’ah of Muhammad, (the Deen) which prevails and dominates over every religion, and that the majority of them have brought the people into doubts and confusion regarding the usool of their Deen, and for this I have rarely heard or seen someone turning away from the Book and the Sunnah, and turning to their (ahlul-bid’ah’s) sayings and opinions except that he falls into heresy or falls into doubt and uncertainty in his Deen and his I’tiqaad.
And indeed their actions and their jihaad in repelling the mukhaalafaat (those matters that oppose the Haqq), and clarification of the condition of its people, and clarification of the great distance of these mukhaalafaat from the guidance of the Book and the Sunnah, and clarification of the rulings of these mukhaalafaat and the rulings of its people from declaring them to be innovators and making inkaar upon them has been recorded. Indeed they carried out this clarification based upon naseehah to Allaah and His Book and His Messenger and the leaders of the Muslims and their common folk, and preservation of their deen in numerous books, whether it was in the field of 'Aqeedah, like in the books of 'Aqaa'id, or Ahkaam, like in the books of Fiqh and explanation of hadeeth, and in the category of the narrations and conveying the Sunnah from Allaah's Messenger (صلى الله غليه وسلم) like in the books of Rijaal (narrators) and 'Illal (hidden defects in the hadeeth), and the books in that are in that are innumerable.” [See Raddu kullil-munkaraat wal-ahwaa' wal-akhtaa'i manhajun shar'ee , pp.24-27]