Sahasradhara

Shri Ram instructed Lakshman to guard the main entry and who ever entered would be punished since the former and Kaala Devata were meditating together on Deva Karya (a certain task of Devas) and were not to be disturbed. But Sage Durvasa arrived and pressurised Lakshman to inform Rama of his arrival and Laxman had to be punished of being disowned. The forsaken Lakshman did severe Tapasya to Parameswara to absolve the indiscretion that he had done due to Durvasa’s unexpected entry. This made ‘Seshanag’ (whose Avatar was Lakshmana) appear and the exraodinary radiance and heat of the jewels of the thousand hoods of Seshanag pierced through the banks of Sarayu River and up came a Sahasradhara Tirtha. Indra and Devas also appeared and the indiscretion of Laksmana due to circumstances beyond his control was pardoned. Such is the power of the Tirtha that even Lakshman’s blunders were pardoned and devotees performing ‘Snaan’, ‘Puja’ and ‘Daan’ in the name of Seshanag (Naga Puja) especially in Vaisakha Month would never bother the fear of Snakes.

 https://www.google.com/search?q=Sahasradhara