Parashara grew up thinking, his grandfather Brahmarshi Vashishtha was his father. When he found out the truth and that his father and uncles were killed by a demon under the influence of rishi Vishwamitra, he decided to conduct a yajna to exterminate all the demons from the world.

Rakshasa from all over the world started burning in the fire of Parashara’s yajna. When Pulastya rishi noticed this destruction he requested Vashishtha rishi to stop his grandson. Rishi Vashishtha told Parashara rishi to stop his yajna for it was not correct to blame all the Rakshasa for the death of his father. 

Parashara rishi eventually calmed down and stopped the yajna. Pulastya rishi blessed the rishi with divine knowledge.

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