Vishnupurana 1.12.30

1.12.30

ekāgracetāḥ satataṃ viṣṇumevātmasaṃśrayam /
dṛṣṭavān pṛthivīnāthaputro nānyaṃ kathañcana //

But Dhruva, being wholly intent on seeing Vishńu, beheld not his mother weeping in his presence, and calling upon him; and the illusion, crying out, "Fly, fly, my child, the hideous spirits of ill are crowding into this dreadful forest with uplifted weapons," quickly disappeared. Then advanced frightful Rákshasas, wielding terrible arms, and with countenances emitting fiery flame; and nocturnal fiends thronged around the prince, uttering fearful noises, and whirling and tossing their threatening weapons. Hundreds of jackals, from whose mouths gushed flame as they devoured their prey, were howling aloud, to appal the boy, wholly engrossed by meditation. The goblins called out, "Kill him, kill him; cut him to pieces; eat him, eat him;" and monsters, with the faces of lions and camels and crocodiles, roared and yelled with horrible cries, to terrify the prince. But all these uncouth spectres, appalling cries, and threatening weapons, made no impression upon his senses, whose mind was completely intent on Govinda. The son of the monarch of the earth, engrossed by one only idea, beheld uninterruptedly Vishńu seated in his soul, and saw no other object.