Mbh 9.35.2a

Vaishampayana said, "After the high-souled Pandavas had taken up their post at Upaplavya, they despatched the slayer of Madhu to Dhritarashtra's presence, for the object of peace, O mighty-armed one, and for the good of all creatures. Having gone to Hastinapura and met Dhritarashtra, Keshava spoke words of true and especially beneficial import. The king, however, as I have told thee before, listened not to those counsels. Unable to obtain peace, the mighty-armed Krishna, that foremost of men, came back, O monarch, to Upaplavya. Dismissed by Dhritarashtra's son, Krishna returned (to the Pandava camp), and upon the failure of his mission, O tiger among kings, said these words unto the Pandavas, 'Urged by Fate, the Kauravas are for disregarding my words! Come, ye sons of Pandu, with me (to the field of battle), setting out under the constellation Pushya!' After this, while the troops (of both sides) were being mustered and arrayed, the high-souled son of Rohini, that foremost of all persons endued with might, addressed his brother Krishna, saying, 'O mighty-armed one, O slayer of Madhu, let us render assistance to the Kurus!' Krishna, however, did not listen to those words of his. With heart filled with rage (at this), that illustrious son of Yadu's race, the wielder of the plough then set out on a pilgrimage to the Sarasvati. Accompanied by all the Yadavas, he set out under the conjunction of the asterism called Maitra. The Bhoja chief (Kritavarma), however, adopted the side of Duryodhana. Accompanied by Yuyudhana, Vasudeva adopted that of the Pandavas. After the heroic son of Rohini had set out under the constellation Pushya, the slayer of Madhu, placing the Pandavas in his van, proceeded against the Kurus. While proceeding, Rama ordered his servants on the way, saying, 'Bring all things that are necessary for a pilgrimage, that is, every article of use! Bring the (sacred) fire that is at Dwaraka, and our priests.