yat pramāṇaṁ janārdanaḥ

esah-the Vedas; eva-certainly; hi-for; lokanam-of all people; sivah-auspicious; panthah-path; sanatanah-eternal; yam-which (Vedic path); purve-in the past; ca-and; anusantasthuh-was rigidly followed; yat-in which; pramanam-the evidence; janardanah-Janardana.