Each and Every Aspect of Tasawwuf is Proven by Quran and Hadeeth
"The denial of Tasawwuf and Salook is not based on knowledge or evidence, but upon ignorance, arrogance and animosity. Because tens of verses of the Holy Quran are the origin and basis of Tasawwuf and Salook. The scholars of the Hadees have presented the Ayat of Ihsan as the proof of this fact. Their explanation can be found in the Ahadees of the Holy Prophet ﷺ and the sayings of the illustrious teachers (Mashaykh). The truth is that not only the axioms, but also the components of Tasawwuf are derived from the Quran and the ways (of the Holy Prophet ﷺ، Sahaba Karam, and the righteous ancestors). We say without fear of denial that the different Sufi Methods and Silsilas-- which involve practices, actions, and the results and fruits of those practices and actions--are validated fully by the derivations (from Quran and Hadees), and the ways and traditions (of the illustrious elders)."
Hazrat Maulana Allah Yar Khan (RA), Dalail-as-Salook