Mahabharata 12.321.22

12.321.22

taṃ dṛṣṭvā mahadāścaryamapūrvaṃ vidhivistaram |
upopaviṣṭaḥ suprīto nārado bhagavānṛṣiḥ || 22 ||

[paragraph continues] 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.