Mbh 3.156.4b

And when all the trees of the spot had been pulled down and crushed into fibres by them endeavouring to kill each other, then, O Bharata, those two of mighty strength, taking up rocks, began to fight for a while, like unto a mountain and a mighty mass of clouds. And not suffering each other, they fell to striking each other with hard and large crags, resembling vehement thunder-bolts. Then from strength defying each other, they again darted at each other, and grasping each other by their arms, began to wrestle like unto two elephants. And next they dealt each other fierce blows. And then those two mighty ones began to make chattering sounds by gnashing their teeth. And at length, having clenched his fist like a five-headed snake, Bhima with force dealt a blow on the neck of the Rakshasa. And when struck by that fist of Bhima, the Rakshasa became faint, Bhimasena stood, catching hold of that exhausted one. And then the god-like mighty-armed Bhima lifted him with his two arms, and dashing him with force on the ground, the son of Pandu smashed all his limbs. And striking him with his elbow, he severed from his body the head with bitten lips and rolling eyes, like unto a fruit from its stem. And Jatasura’s head being severed by Bhimasena’s might, he fell besmeared with gore, and having bitten lips. Having slain Jatasura, Bhima presented himself before Yudhishthira, and the foremost Brahmanas began to eulogise him (Bhima) even as the Marutas (eulogise) Vasava.”