त्वं स्वपापपरिभ्रष्टः क्षीणपुण्यो महीपते ।दश वर्षसहस्राणि सर्परूपधरो महीम् ॥
In plain words
You have fallen, and by your own sin; your merit is spent, O king of the earth. For ten thousand years you will wear a serpent's body and travel that same earth.
Close to the Sanskrit
You, fallen away through your own sin, your merit exhausted, O lord of the earth — for ten thousand years, bearing the form of a serpent, [you shall roam] the earth.