Tatbir (blood ritual, self-flagellation with knives or chains) is a fabricated tradition. It is among the issues that does NOT belong to the religion and undoubtedly Allah is NOT pleased with such practice... *Do NOT Practice it.* _(Ayatollah Khamenei)_
more details: http://clean-the-glasses.blogspot.com/2014/11/fatawa-on-tatbir-blood-ritual-in-ashura.html
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