To neutralise ve effect of that curse, the best of snakes (Vasuki) married off his sister to the high-souled Rishi of rigid vow.
तस्य शापस्य शान्त्यर्थं प्रददौ पन्नगोत्तमः। स्वसारमृषये तस्मै सुव्रताय महात्मने।॥