Mbh 3.87.1a

Vaisampayana said, “Beholding the Pandavas afflicted with anxiety and depressed in spirits, Dhaumya, who resembled Vrihaspati, spake thus, comforting them, ‘O bull of the Bharata race, O sinless one, listen to me as I mention certain sacred asylums and regions and tirthas and mountains that are approved of by Brahmanas. O king, listen to me as I speak, thyself with the daughter of Drupada and thy brothers, wilt, O lord of men, be relieved from grief. And, O son of Pandu, by hearing only of these places, thou wilt acquire merit. And by visiting them thou wilt obtain merit a hundred times greater, O best of men! First, O king, I will, so far as I recollect, speak of the beautiful eastern country, much regarded, O Yudhishthira, by royal Rishis. In that direction, O Bharata is a place called Naimisha which is regarded by the celestials. There in that region are several sacred tirthas belonging to the gods. There also is the sacred and beautiful Gomati which is adored by celestial Rishis and there also in [possibly ‘is’?--JBH] the sacrificial region of the gods and the sacrificial stake of Surya. In that quarter also is that best of hills called Gaya, which is sacred and much regarded by royal ascetics. There on that hill, is the auspicious lake called Brahmasara which is adored by celestial Rishis. It is for this that the ancients say that one should wish for many sons, so that even one among them may visit Gaya, celebrate the horse-sacrifice or give away a nila bull, and thereby deliver ten generations of his race up and down. There, O monarch, is a great river, and spot called Gayasira. In Gayasira is a banian, which is called by the Brahmanas the Eternal banian, for the food that is offered there to the Pitris becometh eternal, O exalted one! The great river that floweth by the place is known by the name of Phalgu, and its waters are all sacred.