One day he went to prey and came to Jamdagni Rishi's Aashram. Jamdagni Rishi had the Kaamdhenu cow in his Aashram, so he entertained Raajaa and his army with it. When Arjun saw this glory which was more than his own, he did not even ask for it and untied the cow and took it forcefully to Mahishmatee Puree. The cow started crying. When they had gone, Parashuraam Jee came at the Aashram and heard the incident. He rushed after them taking His Pharasaa etc.

Sahastrabaahu was about to enter his city that he saw Parashuraam Jee coming towards him, so he sent his 17 Akshauhinee army to fight with Him, but Parashuraam Jee killed all of them in a few moments. Then Sahastrabaahu himself came to fight with Him. He took 500 bows together and aimed his arrows on Parashuraam Jee. But Parashuraam Jee cut all of them with his one arrow. Then he cut Sahastrabaahu's 1,000 arms and then cut his head too. Seeing this his 10,000 sons got frightened and ran away from there.

Parashuraam Jee brought Kaamdhenu back to His Aashram and told everything that happened there. Hearing all that Jamdagni Muni said - "You did not do good, you are very brave but you killed the king without any purpose. Son, we are Braahman. We should have pardoned him. Pardoning is our greatest quality. Even Brahmaa Jee also got Brahmpad because of pardoning. Killing of a king is more than the killing of a Braahman. Go now to Teerth and wash away your sins."