Markandeyapurana 6.37

6.37

ato jagāma rāmo 'sau pratilomāṃ sarasvatīm /
tataḥ paraṃ śṛṇuṣvemaṃ pāṇḍaveyakathāśrayam //

Hence that Rāma went against the stream of the Sarasvatī.
After that, listen to this narrative concerning the sons of Pāṇḍu.

Next listen to this reference to the story of the Pāṇḍaveyas.

When that bard was slain while repeating the words of the Veda, all those brahmans, clad in black antelope skins, departed from the wood. And the plough-armed hero, perceiving himself disregarded, thought, “This is a very grievous sin that I have committed; for since I have come here to a brahmans’ abode and have slain Sūta, these dvijas perceiving me have all departed. And my body has a disgusting odour, as it were of blood, and I perceive that I am contemned as a brahmanicide. Fie on my rage, and the wine, my arrogance, my cruelty! Possessed by them, I have committed this most grievous sin. To expiate it I will perform a twelve-year vow, making the confession of my deed the uttermost penance. This then is the pilgrimage which I have now undertaken; I will go to the Pratilomā Sarasvatī itself.” Hence he, Rāma, went to the Pratilomā Sarasvatī.

6.37.p1

itiśrī mārkaṇḍeyapurāṇe baladevabrahmahatyānāma ṣaṣṭhodhyāyaḥ

Thus ends the sixth chapter, titled "Baladeva's Killing of a Brahmin", in the glorious Mārkaṇḍeya Purāṇa.

6.37.p2

saptamo 'dhyāyaḥ

Chapter Seven