Matsyapurana 156.26

156.26

kṛtvā mukhāntare dantān daityo vajropamāndṛḍhān
tīkṣṇāgrān buddhimohena giriśaṃ hantumudyataḥ //

Getting that boon, the Daitya considered himself immortal and afterwards in order to hide himself from Virabhadra he transformed himself into a serpent and without being noticed by Virabhadra, crawled inside where Śiva was Then, that great Asura, leaving off the disguise of the serpent, masquedered as Pârvatî in order to tempt Śiva. After making his form exquisitely alike Pârvatî by his spell he put on sharp and strong teeth, and made up his mind to kill Śiva He went near Śiva in the form of Pârvatî putting on neat dress and ornaments—21 27