Though it is not necessary, sisters still keep a fast on Raksha Bandhan as a ritual of the Rakhi ceremony. The fasting by sisters is observed in several parts of the country on this auspicious occasion as a mark of respect and protection of their brothers. It is believed that when sisters keep fast for their brothers on Raksha Bandhan, they are blessed with a happy, prosperous and long life.
Another thought behind keeping fasts on this auspicious day is to avoid greed and edacity for this spiritual and sacred festival to keep closeness with God.