हयग्रीव
Hayagrīva or Hayaśīrṣa is the horse-headed descent of the Lord, held to be the guardian of the Vedas and the presiding deity of learning; in the Puranas He recovers the Vedas carried off by Madhu and Kaiṭabha. At SB 2.7.11 His appearance is placed at Brahmā's own sacrifice, where He is called 'the very Person of sacrifice' and 'of the colour of molten gold'; and the particular mark is given that as He merely breathed, lovely Vedic words came forth from His nostrils — so that the unauthored character of the śruti is linked to His breathing.
Śrīmad Bhāgavata Mahāpurāṇa 2.7.11 — Sanskrit Wikisource (pinned oldid=200170)
At Brahma's sacrifice the Lord Himself appeared as Hayashirsha, the very Person of sacrifice, from whose breathing the words of the Veda came forth: 'satre mamasa bhagavan hayashirsha eva sakshat sa yajna-purushah' (SB 2.7.11). Evidence: EXPLICIT.
