Assuming such a form, O Yudhishthira, he has to live for thirteen years. Upon the exhaustion of his sin by such sufferance, he regains the human form.
तत्र जीवति वर्षाणि त्रयोदश युधिष्ठिर। अधर्मसंक्षये युक्तस्ततो जायति मानवः॥