Sahl Ibn-Abdullah Tostari is one of the most outstanding and massine
figures in the Islamic mysticism.
He has had much influence and impact on this sort of mysticism. One
may notice his profound influence in any mystical sources and references.
Some orientalists have done studies conceming him and his immense
influence as well.
In this research, it has been tried to survey this impact through
investigating the related refemces. Then a critical approch toward these
sources and the influence has been put forward.
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