Matsyapurana 44.51

44.51

yajñe devāvṛdho rājā bandhūnāṃ mitravardhanaḥ
aputrastvabhavadrājā cacāra paramaṃ tapaḥ
putraḥ sarvaguṇopeto mama bhūyāditi spṛhan //

Devâvṛidha improved the relations with his kinsmen, but was issueless, and with the intention of having a son he practised devout austerities. With that view, he touched the holy waters of the Parnâśâ at which that river brooded over the desires of Devâvṛidha. She decided in her mind that Devâvṛidha should beget a handsome child like herself, but could not hit upon any lady who would bear him such an offspring. Therefore, she determined in her mind that she herself, having the power of manifesting herself in thousands of ways, would give birth to a child like that, for him. With that resolution, she appeared before the king in the form of a young beauty and attracted the ascetic king towards her ; after which they became enamoured of each other and enjoyed themselves. Nine months after, she gave birth to Vabhru.—51-56.