Devibhagavatapurana 8.8.20

8.8.20

śrīnārāyaṇa uvāca |
evaṃ sa bhagavān rudro devaṃ saṅkarṣaṇaṃ prabhum |
ilāvṛtamupāsīta devīgaṇasamāhitaḥ ||

Nârâyana said:-- Thus the Bhagavân Rudra, with His Own persons in Ilâvrita Varsa used to worship the Devî and the Sankarsana, the Controller of all the Lokas. The son of Dharma, well known by the name of Bhadras'rava and all the persons born of his family and his attendants, worship thus the Devî. This form is well known to all by the name of Hayagrîva and worshipped thus. All the persons there worship Him with the intense meditation and Samâdhi and realise Him thoroughly. Then they praise Him, according to due customs and get the thorough Siddhis (success in getting extraordinary powers).