Sufism
Etymology

The original meaning of ṣūfī seems to have been "one who wears wool (ṣūf)", and the Encyclopaedia of Islam calls other etymological hypotheses "untenable". Woolen clothes were traditionally associated with ascetics and mystics. Al-Qushayri and Ibn Khaldun both rejected all possibilities other than ṣūf on linguistic grounds.

Another explanation traces the lexical root of the word to ṣafā (صفاء), which in Arabic means "purity", and in this context another similar idea of tasawwuf as considered in Islam is tazkiyah (تزكية, meaning: self-purification), which is also widely used in Sufism. These two explanations were combined by the Sufi al-Rudhabari (d. 322 AH), who said, "The Sufi is the one who wears wool on top of purity."

Others have suggested that the word comes from the term Ahl al-Ṣuffa ("the people of the suffah or the bench"), who were a group of impoverished companions of Muhammad who held regular gatherings of dhikr, one of the most prominent companion among them was Abu Hurayra. These men and women who sat at al-Masjid an-Nabawi are considered by some to be the first Sufis.
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