Bhagavatapurana 8.22.10

8.22.10

itthaṃ sa niścitya pitāmaho mahān agādhabodho bhavataḥ pādapadmam /
dhruvaṃ prapede hy akutobhayaṃ janād bhītaḥ svapakṣakṣapaṇasya sattama //

10. "Having thus conclusively known the truth my great and worthy grand-father of deep wisdom, afraid of rebirth, betook himself to the eternal asylum of Thy lotus-like feet where no fear exists; hence he has become the most worthy in the eyes of Him who destroys his own Asura race.