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Ans. Upavas means fasting for twenty-four hours from the sunrise today to the sunrise on the next day, during which one does not take any kind of food or liquids but may drink the boiled water. It is preferred if one can do the chauvihar or the tivihar the night before. a) Tivihar upavas – During this, one does not take any food or drink any liquids except the boiled water only.
