Vishnupurana 2.12.30

2.12.30

yad ahnā kurute pāpaṃ dṛṣṭvā taṃ niśi mucyate
yāvantyaś caiva tārās tāḥ śiśumārāśritā divi
tāvanty eva tu varṣāṇi jīvaty abhyadhikāni ca //

The celestial porpoise, in which Dhruva is fixed, has been mentioned, but you shall hear its constituent parts in more detail, as it is of great efficacy; for the view of it at night expiates whatever sin has been committed during the day; and those who behold it live as many years as there are stars in it, in the sky, or even more. Uttánapáda is to be considered as its upper jaw; Sacrifice as its lower. Dharma is situated on its brow; Náráyańa in its heart. The Áswins are its two fore feet;