Mahabharata 9.53.35

9.53.35

sarasvatī sarvanadīṣu puṇyā sarasvatī lokasukhāvahā sadā |
sarasvatīṃ prāpya janāḥ suduṣkṛtāḥ sadā na śocanti paratra ceha ca || 35 ||

Vaishampayana continued, "Hearing these words of Narada, Rama bade a respectful farewell to those foremost of Brahmanas and dismissed all those that had accompanied him (in his pilgrimage). Indeed, he ordered his attendants, saying, 'Return ye to Dwaraka!' He then descended from that prince of mountains and that fair hermitage called Plakshaprasravana. Having listened to the discourse of the sages about the great merits of tirthas, Rama of unfading glory sang this verse in the midst of the Brahmanas, 'Where else is such happiness as that in a residence by the Sarasvati? Where also such merits as those in a residence by the Sarasvati? Men have departed for heaven, having approached the Sarasvati! All should ever remember the Sarasvati! Sarasvati is the most sacred of rivers! Sarasvati always bestows the greatest happiness on men! Men, after approaching the Sarasvati, will not have to grieve for their sins either here or hereafter!' Repeatedly casting his eyes with joy on the Sarasvati, that scorcher of foes then ascended an excellent car unto which were yoked goodly steeds. Journeying then on that car of great fleetness, Baladeva, that bull of Yadu's race, desirous of beholding the approaching encounter of his two disciples arrived on the field."