Matsyapurana 146.43

146.43

tapaso 'nte bhagavatī janayāmāsa durjayam
putramapratikarmāṇam ajeyaṃ vajraduśchidam //

Diti, after being thus blessed, repaired to the forest where she practised severe austerities for ten thousand years At the close of her period of austerities, she begot a son who was of wonderful deeds, unconquerable and invulnerable even by the thunderbolt. He became thoroughly conversant in all the Śastras as soon as he was born and devoutly said to his mother —"mother! direct me what I should do for you"—42 44