There in Badarikāśrama the Personality of Godhead, in His incarnation as the sages Nara and Nārāyaṇa, has been undergoing great penance since time immemorial for the welfare of all amiable living entities.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यत्र नारायणो देवो नरश्च भगवान् ऋषिः । मृदु तीव्रं तपो दीर्घं तेपाते लोकभावनौ
yatra nārāyaṇo devo naraśca bhagavān ṛṣiḥ | mṛdu tīvraṃ tapo dīrghaṃ tepāte lokabhāvanau
SB 3.4.22