Mbh 2.20.3b

For the accomplishment of one’s purpose let, therefore, Arjuna, the son of Pritha, follow Krishna the foremost of the Yadavas and let Bhima follow Arjuna. Policy and good fortune and might will (then) bring about success in a matter requiring valour.’ Vaisampayana said,--‘Thus addressed by Yudhishthira, the trio Krishna, Arjuna and Bhima, all possessed of great energy, set out for Magadha attired in the garb of Snataka Brahmanas of resplendent bodies, and blessed by the agreeable speeches of friends and relatives. Possessed of superior energy and of bodies already like the Sun, the Moon, and the Fire, inflamed with wrath at the sad lot of their relative kings, those bodies of theirs became much more blazing. And the people, beholding Krishna and Arjuna, both of whom had never before been vanquished in battle, with Bhima in the van, all ready to achieve the same task, regarded Jarasandha as already slain. For the illustrious pair (Krishna and Arjuna) were masters that directed every operation (in the universe), as also all acts relating to the morality, wealth, and pleasure of every being. Having set out from the country of the Kurus, they passed through Kuru-jangala and arrived at the charming lake of lotuses. Passing over the hills of Kalakuta, they then went on crossing the Gandaki, the Sadanira (Karatoya), and the Sarkaravarta and the other rivers taking their rise in the same mountains. They then crossed the delightful Sarayu and saw the country of Eastern Kosala. Passing over that country they went to Mithila and then crossing the Mala and Charamanwati, the three heroes crossed the Ganges and the Sone and went on towards the east. At last those heroes of unfaded glory arrived at Magadha in the heart of (the country of) Kushamva. Reaching then the hills of Goratha, they saw the city of Magadha that was always filled with kine and wealth and water and rendered handsome with the innumerable trees standing there.’”