Mbh 17.1.8

"'Proceeding on, those heroes reached the sea of red waters. Dhananjaya had not cast off his celestial bow Gandiva, nor his couple of inexhaustible quivers, actuated, O king, by the cupidity that attaches one to things of great value. The Pandavas there beheld the deity of fire standing before them like a hill. Closing their way, the god stood there in his embodied form. The deity of seven flames then addressed the Pandavas, saying, "Ye heroic sons of Pandu, know me for the deity of fire. O mighty-armed Yudhishthira, O Bhimasena that art a scorcher of foes, O Arjuna, and ye twins of great courage, listen to what I say! Ye foremost ones of Kuru's race, I am the god of fire. The forest of Khandava was burnt by me, through the puissance of Arjuna and of Narayana himself. Let your brother Phalguna proceed to the woods after casting off Gandiva, that high weapon. He has no longer any need of it. That precious discus, which was with the high-souled Krishna, has disappeared (from the world). When the time again comes, it will come back into his hands. This foremost of bows, Gandiva, was procured by me from Varuna for the use of Partha. Let it be made over to Varuna himself."