Raksha Bandhan (Rakhi), Jandhyala / Sravana Poornima - Mythological References
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When Daitya Raja, a Rakshasa (demon) gained advantage over Indra, the King of Heavens, in a fierce battle between them. Indra's wife, Sachi, on advice of sage Brihaspati, sought help from Vishnu. Vishnu gave her a "Raksha Bandhan" and advised her to tie it around the wrist of Indra, on that full moon day; this brought success to Indra who subsequently won the war and riches that he had lost to the demons.
This story was cited by Krishna when Dharmaraj wanted to know how to protect this world during the expected oncoming evil in Kaliyug.
People of Northern India celebrate this festival to wish their siblings to be hale, healthy and strong as the Emperor Bali was wished once, as per their belief.