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SB 12.6.73
suta uvaca
evam stutah sa bhagavan
vaji-rupa-dharo ravih
yajumsy ayata-yamani
munaye ’dat prasaditah
Translation:
Suta Gosvami said: Satisfied by such glorification, the powerful sun-god assumed the form of a horse and presented to the sage Yajñavalkya yajur-mantras previously unknown in human society.