subject: raksha bandhan [print this page] During the battle between Indra and demons Guru Brihaspati advised Indra to tie a sacred thread on the day of Shravan Purnima . On that day, Indra's wife and Brihaspati tied a sacred thread on the wrist of Indra, who then attacked the demons and defeated them. Thus the Raksha Bhandhan symbolizes of protection evil forces.