Sūta Gosvāmī said: Satisfied by such glorification, the powerful sun-god assumed the form of a horse and presented to the sage Yājñavalkya yajur-mantras previously unknown in human society.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सूत उवाच । एवं स्तुतः स भगवान् वाजिरूपधरो हरिः । यजूंष्ययातयामानि मुनयेऽदात्प्रसादितः
sūta uvāca | evaṃ stutaḥ sa bhagavān vājirūpadharo hariḥ | yajūṃṣyayātayāmāni munaye'dātprasāditaḥ
SB 12.6.73