佛說七俱胝佛母心大准提陀羅尼經 0.p10

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“Moreover, there is a method for a country that is suffering from flooding, droughts, or epidemics. You should prepare an even mixture of sesame seeds and non-glutinous rice. Use three fingers to obtain a pinch of this mixture. Then mantra with it, and place it in the fire to burn. Continue this for seven days and seven nights, in the six periods of the day and night, uninterrupted. Every disaster and epidemic will be annihilated.