Imam Jafar Al-Sadiq (a.s.), The earth of the pure and holy grave of Imam Husain (a.s.) is a pure and blessed musk. For those who consume it from among our Shias, it is a cure for every ailment, and if our enemy uses it then he will melt the way fat melts, when you intend to consume that pure earth recite the following supplication Mustadrakul Wasail, vol. 10 pg 339-40 tradition 2; New edition of Makarimul Akhlaq p.189; Beharul Anwar, vol. 101, p. 23, tradition 60
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