Mbh 15.37.5a

"'Narada said, "Listen, O king, with calmness to me as I tell thee what I have heard and seen in that ascetic retreat. After thy return from Kurukshetra, O delighter of the Kurus, thy sire, O king, proceeded towards Gangadwara. That intelligent monarch took with him his (sacred) fire, Gandhari and his daughter-in-law Kunti, as also Sanjaya of the Suta caste, and all the Yajakas. Possessed of wealth of penances, thy sire set himself to the practice of severe austerities. He held pebbles of stone in his mouth and had air alone for his subsistence, and abstained altogether from speech. Engaged in severe penances, he was worshipped by all the ascetics in the woods. In six months the king was reduced only to a skeleton. Gandhari subsisted on water alone, while Kunti took a little every sixth day. The sacred fire, O monarch, (belonging to the Kuru king) was duly worshipped by the sacrificing assistants that were with him, with libations of clarified butter poured on it. They did this whether the king saw the rite or not. The king had no fixed habitation. He became a wanderer through those woods. The two queens, as also Sanjaya, followed him. Sanjaya acted as the guide on even and uneven land. The faultless Pritha, O king, became the eye of Gandhari. One day, that best of kings proceeded to a spot on the margin of Ganga. He then bathed in the sacred stream and finishing his ablutions turned his face towards his retreat. The wind rose high. A fierce forest-conflagration set in. It began to burn that forest all around. When the herds of animals were being burnt all around, as also the snakes that inhabited that region, herds of wild boars began to take themselves to the nearest marshes and waters. When that forest was thus afflicted on all sides and such distress came upon all the living creatures residing there, the king, who had taken no food, was incapable of moving or exerting himself at all. Thy two mothers also, exceedingly emaciated, were unable to move.