Mbh 13.25.3d

Ten thousand tirthas and thirty millions of other tirthas come to Prayaga (the confluence of Ganga and Yamuna), O chief of Bharata's race in the month of Magha. He who bathes in Prayaga, with a restrained soul and observing rigid vows the while, in the month of Magha, becomes cleansed of all his sins, O chief of Bharata's race, and attains to heaven. Bathing in the tirtha that is sacred to the Maruts, as also in that which is situate in the retreat of the Pitris, and also in that which is known by the name of Vaivaswata, one becomes cleansed of all one's sins and becomes as pure and sanctified as a tirtha. Repairing to Brahmasaras as also to the Bhagirathi and bathing there and offering oblations to the Pitris every day for a full month, abstaining from food all the while, one is sure to attain to the region of Soma. Bathing in Utpataka and then in Ashtavakra and offering oblations of water to the Pitris every day for twelve days in succession, abstaining the while from food, one acquires the merits of a Horse-sacrifice. Bathing in Asmaprishtha and Niravinda mountains and Kraunchapadi,--all three in Gaya--one becomes cleansed of the sin of Brahmanicide. A bath in the first place cleanses one of a single Brahmanicide; a bath in the second cleanses one of two offences of that character; and a bath in the third cleanses one of three such offences. Bathing in Kalavinga, one acquires a large quantity of water (for use in the next world). A man, by bathing in the city of Agni, acquires such merit as entitles him to live during his next birth in the city of Agni's daughter. Bathing in Visala in Karavirapura and offering oblations of water unto one's Pitris, and performing one's ablutions in Devahrada too, one becomes identified with Brahma and shines in glory as such.