SB 12.8.35
te vai bhagavato rupe
nara-narayanav rsi
drstvotthayadarenoccair
nanamangena danda-vat
Translation:
These two sages, Nara and Narayana, were the direct personal forms of the Supreme Lord. When Markandeya Rsi saw Them, he immediately stood up and then with great respect offered Them obeisances by falling down flat on the ground like a stick.