Mbh 3.38.4a

“At Yudhishthira’s command, Dhananjaya of immeasurable prowess set out (from Kamyaka) to obtain a sight of Sakra, the chief of the celestials and of Sankara, the god of gods. And the strong-armed Arjuna of great might set out armed with his celestial bow and a sword with golden hilt, for the success of the object he had in view, northwards, towards the summit of the Himavat. And, O king, that first of all warriors in the three worlds, the son of Indra, with a calm mind, and firmly adhering to his purpose, then devoted himself, without the loss of any time, to ascetic austerities. And he entered, all alone, that terrible forest abounding with thorny plants and trees and flowers and fruits of various kinds, and inhabited by winged creatures of various species, and swarming with animals of diverse kinds, and resorted to by Siddhas and Charanas. And when the son of Kunti entered that forest destitute of human beings, sounds of conchs and drums began to be heard in the heavens. And a thick shower of flowers fell upon the earth, and the clouds spreading over the firmament caused a thick shade. Passing over those difficult and woody regions at the foot of the great mountains, Arjuna soon reached the breast of the Himavat; and staying there for sometime began to shine in his brilliancy. And he beheld there numerous trees with expanding verdure, resounding with the melodious notes of winged warblers. And he saw there rivers with currents of the lapis lazuli, broken by the fierce eddies here and there, and echoing with the notes of swans and ducks and cranes. And the banks of those rivers resounded with the mellifluous strains of the male Kokilas and the notes of peacocks and cranes. And the mighty warrior, beholding those rivers of sacred and pure and delicious water and their charming banks, became highly delighted. And the delighted Arjuna of fierce energy and high soul then devoted himself to rigid austerities in that delightful and woody region.