अत्रैवोदाहरन्तीममितिहासं पुरातनम् ।भ्रात्रोस्त्रिपथगातीरे संवादं मुनिपुत्रयोः
In plain words
Śrī Vasiṣṭha said: On this very matter they cite this ancient itihāsa: a dialogue between two brothers, sons of a muni, on the bank of the tripathagā, the river of the triple course.