Mbh 3.178.1

Vaisampayana continued, “And the powerful Bhimasena, having thus come under the power of the snake, thought of its mighty and wonderful prowess; and said unto it, ‘Be thou pleased to tell me, O snake, who thou art. And, O foremost of reptiles, what wilt thou do with me? I am Bhimasena, the son of Pandu, and next by birth to Yudhishthira the just. And endued as I am with the strength of ten thousand elephants, how hast thou been able to overpower me? In fight have been encountered and slain by me innumerable lions, and tigers, and buffaloes, and elephants. And, O best of serpents, mighty Rakshasas and Pisachas, and Nagas, are unable to stand the force of my arms. Art thou possessed of any magic, or hast thou received any boon, that although exerting myself, I have been overcome by thee? Now I have been convinced that the strength of men is false, for, O serpent, by thee hath such mighty strength of men been baffled.’