Mahabharata Drona Parva Chapter 200:3

Mahabharata Drona Parva (Drona-vadha Parva) Chapter 200:3 Beholding these two strong arms of mine like unto the trunks of a couple of mighty elephants, capable of pulling down the mountain of Himavat, I am the one person here that possesses the might of the thousand elephants. I am without a peer, even as Sakra is known to be in heaven among the celestials. Let people witness today the prowess of these two arms of my broad-chested self, while engaged in baffling the bright and blazing weapon of Drona's son. If there be none (else) capable of contending against the Narayana weapon, even I shall contend against it today in the very sight of all the Kurus and the Pandavas. O Arjuna, O Vibhatsu, thou shouldst not lay Gandiva aside. A stain will then attach to thee like that of the moon." Thus addressed by Bhima, Arjuna said, "O Bhima, even this is my great vow, viz., that my Gandiva shall not be used against the Narayana weapon, kine, and Brahmanas. Thus answered by Arjuna, Bhima, that chastiser of foes, riding on his car of solar effulgence, whose rattle, besides, resembled the roar of the clouds, rushed against the son of Drona. Endued with great energy and prowess, the son of Kunti, in consequence of his extreme lightness of hand, within the twinkling of an eye, covered Aswatthaman with a shower of weapons. Then Drona's son, smiling at the rushing Bhima and addressing him (in proper words) covered him with arrows, inspired with mantras and equipped with blazing points. Shrouded with those shafts that vomited fire and resembled snakes of blazing mouths, as if covered with sparks of gold, the form, O king, of Bhimasena in that battle looked like that of a mountain in the evening when covered with fire. That weapon of Drona's son, directed against Bhimasena increased in energy and might, O king, like a conflagration assisted by the wind. Beholding that weapon of terrible energy thus increasing in might, a panic entered the hearts of all the combatants of the Pandava army with the exception of Bhima. Then all of them, throwing down their weapons on the earth, alighted from their cars and steeds. After they had thrown their weapons and alighted from their vehicles, that weapon of exceeding energy fell upon the head of Bhima. All creatures, especially the Pandavas, uttered cries of Oh and Alas, beholding Bhimasena overwhelmed by the energy of that weapon.