Mahabharata 3.174.23

3.174.23

plakṣākṣarauhītakavetasāśca snuhā badaryaḥ khadirāḥ śirīṣāḥ |
bilveṅgudāḥ pīluśamīkarīrāḥ sarasvatītīraruhā babhūvuḥ || 23 ||

Then seeing them enter Dwaitabana, the dwellers of that place engaged in asceticism, religious ordinances, and self-restraining exercises and in deep and devout meditation and subsisting on things ground with stone (for want of teeth) having procured grass-mats and water-vessels, advanced to meet them. The holy fig, the rudaraksha, the rohitaka, the cane and the jujube, the catechu, the sirisha, the bel and the inguda and the karira and pilu and sami trees grew on the banks of the Saraswati. Wandering about with contentment in (the vicinity of) the Saraswati which was, as it were, the home of the celestials, and the favourite (resort) of Yakshas and Gandharvas and Maharshis, those sons of kings lived there in happiness."