It is this holy water point (The Parkulam) of the temple where Vashista Maharishi performed a pooja here, by making a lingam with the butter from the Parkulam. After completing the pooja he tried to move that lingam, but it sticked to that place, and never moved. As a result Vashista Maharishi regarded this place as Sikkal. Here the Lord Shiva is called ‘Thiru Vennai Nathar’ (Vennai means butter) as he was made up of butter. Interestingly, Thirukkannankudi – a Vaishnava Divyadesam has a legend associated with Vasishta offering worship to an image of Krishna which he had fashioned out of butter.