The Great Epic of the Bhārata dynasty 3.82.86

3.82.86

tataḥ phalguṃ vrajedrājaṃstīrthasevī narādhipa |
aśvamedhamavāpnoti siddhiṃ ca mahatīṃ vrajet || 86 ||

There, O king, on the mountains, the cow called Kapila used to range with her calf. There is little doubt, of this, O Bharata, the hoof-marks, of that cow and her calf are seen there to this day. By bathing in those hoof-prints, O foremost of monarchs, whatever sin a man may have incurred is, O Bharata, washed away. Then should one go to Gridhravata, the spot consecrated to the trident-bearing god. Approaching the deity having the bull for his mark one should rub himself with ashes. If a Brahmana, he obtains the merit of observing the twelve year's vow and if belonging to any of the other orders, he is freed from all his sins. One should next proceed to the Udyanta mountains, resounding with melodious notes. There, O bull of the Bharata race, is still seen the foot-print of Savitri. The Brahmana of rigid vows, who sayeth his morning, noon and evening prayers there, obtaineth the merit of performing that service for twelve years. There, O bull of the Bharata race, is the famous Yonidwara. Repairing thither, a person becometh exempted from the pain of rebirth. The person that stayeth at Gaya during both the dark and lighted fortnights, certainly sanctifieth, O king, his own race up and down to the seventh generation. One should wish for many sons so that even one may go to Gaya, or celebrate the horse-sacrifice, or offer a nila bull. Then, O king, the pilgrim should proceed to Phalgu. By this, he obtains the merit of horse-sacrifice, and acquires great success.