Mbh 1.158.2

“Vaisampayana said, ‘Those mighty car-warriors, the heroic Pandavas, then went, O king, from forest to forest killing deer and many animals (for their food). And in the course of their wanderings they saw the countries of the Matsyas, the Trigartas, the Panchalas and then of the Kichakas, and also many beautiful woods and lakes therein. And they all had matted locks on their heads and were attired in barks of trees and the skins of animals. Indeed, with Kunti in their company those illustrious heroes were attired in the garbs of ascetics. And those mighty car-warriors sometimes proceeded in haste, carrying their mother on their backs; and sometimes they proceeded in disguise, and sometimes again with great celerity. And they used to study the Rik and the other Vedas and also all the Vedangas as well as the sciences of morals and politics. And the Pandavas, conversant with the science of morals, met, in course of their wanderings their grandfather (Vyasa). And saluting the illustrious Krishna-Dwaipayana, those chastisers of enemies, with their mother, stood before him with joined hands.’