Bhagavatapurana 10.2.19

19. That Devaki who now became a special biding place of the Lord in whom all the Universe dwells, did not shine best, (was not a source of delight to the world at large), as she was imprisoned in the house of the Bhoja king, like the flame of fire under a cover and like great learning in a narrow-minded man who would not impart it to others.

20. When he saw that Devaki of pure smiles, filled with the presence of Ajita (Vishnu) illuminated the palace with the lustre of her person, Kamsa said to himself, "This is Hari who aims at my life and has certainly resorted to this cave (is present in her womb); for never before looked she so brilliant as now.