Sufism
Throughout its history, Sufism has widely used esoteric interpretation of the Qur'an. The metaphysical basis of a Sufi interpretation is Kashf (unveiling) or Zawq (tasting). Sufi writings make frequent references to the Qur'an and present esoteric interpretations either explicitly or implicitly. Implicit forms being quoting a verse in a certain context which suggests that the meaning of the verse is related to the ideas presented.
There are some verses in the Qur'an whose conventional interpretations suggest mystic ideas and Sufis have commented extensively on them. While all Sufi interpretations are basically mystic, three major trends in Sufi interpretations can be recognized, mystic, philosophic, and esoteric.
The distinction is not always clear and sometimes these coexist in works of a particular Sufi author. Historically the mystic interpretations were the first to appear in Sufi writings, the second and third being philosophic and esoteric interpretations.
A famous Sufi commentary on the Qur'an, the Persian book Kashf Al Asrar (The Unveiling of the Mysteries) by Meybodi, mentions conventional interpretations as the first level of meaning and esoteric interpretations as a deeper level. It is common in Sufi writings to explain three or four levels of meaning of a Qur'anic concept.
Read more about this topic: Esoteric Interpretation Of The Quran