The Great Epic of the Bhārata dynasty 3.81.52

3.81.52

pūtātmānaśca rājendra prayānti paramāṃ gatim |
daśāśvamedhikaṃ caiva tasmiṃstīrthe mahīpate |
tatra snātvā naravyāghra gaccheta paramāṃ gatim || 52 ||

And, O great king, it hath been seen that one merit of that tirtha which rarely belongs to any other, is that one only going thither obtaineth holiness. By casting off his hair in that tirtha one acquireth, O Bharata, great sanctity. There, in that tirtha, is another called Shwavillomapaha, where, O tiger among men, and chief of the Bharata race, learned Brahmanas that go to tirthas obtain great satisfaction by a dip into its waters. Good Brahmanas, O king, by casting off their hair in that tirtha acquire holiness by Pranayama and finally attain to a high state. There, O king, in that tirtha is also another called Dasaswamedhika. Bathing there, O tiger among men, one attains to a high state. One should next proceed, O king, to the celebrated tirtha called Manusha where, O king, a number of black antelopes afflicted by the hunter's arrows, plunging into its waters, were transformed into human beings. Bathing in that tirtha, leading a Brahmacharya mode of life and with concentrated soul, a man becomes freed from all his sins and is adored in heaven. Distant by a krosa, O king, to the east of Manusha there is a river celebrated by the name of Apaga that is restored to by the Siddhas. The man that offereth there the syamaka grain in honour of the gods and the Pitris acquireth great religious merit. And if one Brahmana is fed there, it becomes equivalent to feeding ten millions of Brahmanas.