Mbh 3.179.1a

Vaisampayana continued, “Yudhishthira, finding his beloved brother coiled by the body of the serpent, said these words: ‘O son of Kunti, how hast thou come by this misfortune! And who is this best of serpents having a body like unto a mountain mass?’ Bhimasena said, ‘O worshipful one, this mighty being hath caught me for food. He is the royal sage Nahusha living in the form of a serpent.’ Yudhishthira said, ‘O longlived one, do thou free my brother of immeasurable prowess; we will give thee some other food which will appease thy hunger.’ The serpent said, ‘I have got for diet even this son of a king, come to my mouth of himself. Do thou go away. Thou shouldst not stay here. (If thou remainest here) thou too shall be my fare to-morrow. O mighty-armed one, this is ordained in respect of me, that he that cometh unto my place, becometh my food and thou too art in my quarter. After a long time have I got thy younger brother as my food; I will not let him off; neither do I like to have any other food.’ Thereat Yudhishthira said, ‘O serpent, whether thou art a god, or a demon, or an Uraga, do thou tell me truly, it is Yudhishthira that asketh thee, wherefore, O snake, hast thou taken Bhimasena? By obtaining which, or by knowing what wilt thou receive satisfaction, O snake, and what food shall I give thee? And how mayst thou free him.’ The serpent said, ‘O sinless one, I was thy ancestor, the son of Ayu and fifth in descent from the Moon. And I was a king celebrated under the name of Nahusha. And by sacrifices and asceticism and study of the Vedas and self-restraint and prowess I had acquired a permanent dominion over the three worlds. And when I had obtained such dominion, haughtiness possessed me. And thousands of Brahmanas were engaged in carrying my chair. And intoxicated by supremacy, I insulted those Brahmanas. And, O lord of the earth, by Agastya have I been reduced to this pass! Yet, O Pandava, to this day the memory (of my former birth) hath not forsaken me!