Mbh 12.335.2b

--'This is truly the retreat of that Being in whom are established all the worlds including the deities, the Asuras, the Gandharvas, the Kinnaras, and the great snakes! There was only one form of this great Being before. That form took birth in four shapes for the expansion of the race of Dharma which have been reared by that deity. How wonderful it is that Dharma has thus been honoured by these four great deities viz., Nara, Narayana, and Hari and Krishna! In this spot Krishna and Hari dwelt formerly. The other two, however, viz., Nara and Narayana, are now dwelling here engaged in penances for the object of enhancing their merit. These two are the highest refuge of the universe. What can be the nature of the daily rites these two perform? They are the sires of all creatures, and the illustrious deities of all beings. Endued with high intelligence, what is that deity whom these two worship? Who are those Pitris whom these two Pitris of all beings adore?'--Thinking of this in his mind, and filled with devotion towards Narayana, Narada suddenly appeared before those two gods. After those two deities had finished their adoration to _their_ deities and the Rishis, they looked at the celestial Rishi arrived at their retreat. The latter was honoured with those eternal rites that are ordained in the scriptures. Beholding that extraordinary conduct of the two original deities in themselves worshipping other deities and Pitris, the illustrious Rishi Narada took his seat there, well pleased with the honours he had received. With a cheerful soul he cast his eyes then on Narayana, and bowing unto Mahadeva he said these words.