Ramayana
यावत्तव कथा लोके विचरिष्यति पावनी । तावत्स्थास्यामि मेदिन्यां तवाज्ञामनुपालयन् ॥ 7-108-36 ॥
"So long as Your sanctifying story shall move about in the world, for that long shall I abide upon the earth, observing Your command."
english translation