Mbh 9.63.2a

Vaishampayana said, "The question thou askest me, O king, is, indeed, worthy of thee! I will tell thee everything truly as it occurred, O bull of Bharata's race! Beholding Duryodhana, the mighty son of Dhritarashtra, struck down by Bhimasena in contravention of the rules of fair fight, in fact, beholding the Kuru king slain unfairly, O Bharata, Yudhishthira, O monarch, became filled with great fear, at the thought of the highly blessed Gandhari possessed of ascetic merit. 'She hath undergone severe ascetic austerities and can, therefore, consume the three worlds,' even thus thought the son of Pandu. By sending Krishna, Gandhari, blazing with wrath, would be comforted before Yudhishthira's own arrival. 'Hearing of the death of her son brought to such a plight by ourselves, she will, in wrath, with the fire of her mind, reduce us to ashes! How will Gandhari endure such poignant grief, after she hears her son, who always fought fairly, slain unfairly by us?' Having reflected in this strain for a long while, king Yudhishthira the just, filled with fear and grief, said these words unto Vasudeva: 'Through thy grace, O Govinda, my kingdom hath been reft of thorns! That which we could not in imagination even aspire to obtain hath now become ours, O thou of unfading glory! Before my eyes, O mighty-armed one, making the very hair stand on end, violent were the blows that thou hadst to bear, O delighter of the Yadavas! In the battle between the gods and the Asuras, thou hadst, in days of old, lent thy aid for the destruction of the foes of the gods and those foes were slain! In the same way, O mighty-armed one, thou hast given us aid, O thou of unfading glory! By agreeing to act as our charioteer, O thou of Vrishni's race, thou hast all along protected us! If thou hadst not been the protector of Phalguna in dreadful battle, how could then this sea of troops have been capable of being vanquished?