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https://muhsinnorpaizin.com/2018/09/12/kitab-al-kasb-part-7-invalidating-the-obfuscations-of-some-of-the-sufis-in-regard-to-their-prohibition-of-earning/
Kitab Al-Kasb (Part 7): Invalidating the Obfuscations of Some of the Sufis in Regard to Their Prohibition of Earning