Mbh 3.146.2a

Vaisampayana continued. “Then knowing him (Bhima) to be intoxicated with strength, and proud of the might of his arms, Hanuman, slighting him at heart, said the following words, ‘Relent thou, O sinless one. In consequence of age, I have no strength to get up. From pity for me, do thou go, moving aside my tail.’ Being thus addressed by Hanuman, Bhima proud of the strength of his arms, took him for one wanting in energy and prowess, and thought within himself, ‘Taking fast hold of the tail, will I send this monkey destitute of energy and prowess, to the region of Yama.’ Thereat, with a smile he slightingly took hold of the tail with his left hand; but could not move that tail of the mighty monkey. Then with both arms he pulled it, resembling the pole reared in honour of Indra. Still the mighty Bhima could not raise the tail with both his arms. And his eye-brows were contracted up, and his eyes rolled, and his face was contracted into wrinkles and his body was covered with sweat; and yet he could not raise it. And when after having striven, the illustrious Bhima failed in raising the tail, he approached the side of the monkey, and stood with a bashful countenance. And bowing down, Kunti’s son, with joined hands, spake these words, ‘Relent thou, O foremost of monkeys; and forgive me for my harsh words. Art thou a Siddha, or a god, or a Gandharva, or a Guhyaka? I ask thee out of curiosity. Tell me who thou art that hast assumed the shape of monkey, if it be not a secret, O long-armed one, and if I can well hear it. I ask thee as a disciple, and I, O sinless one, seek thy refuge.’ Thereupon Hanuman said, ‘O represser of foes, even to the extent of thy curiosity to know me, shall I relate all at length. Listen, O son of Pandu! O lotus-eyed one, I was begotten by the wind-god that life of the world--upon the wife of Kesari. I am a monkey, by name Hanuman.