"Qawā'id al-Tasawwuf" (Principles of Sufiism) by Imam Az-Zarrūq ash Shadhili (AUN)

[Mohamedamiin120]

A book explaining the fundamentals of Tasawwuf. This all time classic is more needed now then ever as the people's knowledge on Tasawwuf has been clouded in recent eras.
https://kutub.nur.nu/English/Zarruq_Qawaaid-al-tasawwuf_Principles-of-Sufism_transl.Z.Istrabadi.pdf