If one commits a sin one has to commit expiation to get over the guilt. Prayaschitta depends on the type of sin committed. There are two types of sins: Mahapatakas and Upapatakas. Mahapatakas include killing a person of knowledge, drinking intoxicating liquids and smoking. Upapatakas include neglect of sacred fire, offending one's teacher, theft, nonpayment of debts, selling banned articles, cutting down trees or killing animals who are not dangerous.
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