Mahabharata Drona Parva Chapter 126:3

Mahabharata Drona Parva (Jayadratha-Vadha Parva) Chapter 126:3 Smilingly, he struck the son of Pandu in his forehead with a shaft. Thereupon, the son of Pandu looked resplendent like the sun with upward rays. The preceptor thought that Bhima would show him reverence as Phalguna had done before. Addressing Vrikodara, therefore, he said, "O Bhimasena, it is beyond thy power to enter into the hostile host, without vanquishing me, thy foe, in battle, O thou of mighty strength! Although Krishna with thy younger brother hath penetrated this host with my permission, thyself, however, will never succeed in doing so." Hearing these words of the preceptor, the dauntless Bhima, excited with wrath, and his eyes red as blood or burnished copper, quickly replied unto Drona, saying, "O wretch of a Brahmana, it cannot be that Arjuna hath entered this host with thy permission. He is invincible. He would penetrate into the host commanded by Sakra himself. If he offered thee reverential worship, it was only for honouring thee. But know, O Drona, that myself, I am not compassionate like Arjuna. On the other hand, I am Bhimasena, thy foe. We regard thee as our father, preceptor, and friend. Ourselves we look upon as thy sons. Thinking so we always humble ourselves to thee. When, however, thou usest such words towards us today, it seems that all that is altered. If thou regardest thyself as our foe, let it be as thou thinkest. Being none else than Bhima, I will presently act towards thee as I should towards a foe." Saying this, Bhima whirling a mace, like the Destroyer himself whirling his fatal rod, hurled it, O king, at Drona. Drona, however, had quickly jumped down from his car, (and that proved his safety). For that mace pressed down into the earth the car of Drona, with its steeds, driver, and standard. Then Bhima crushed numerous warriors like the tempest crushing trees with its force. Then those sons of thine once more encompassed that foremost of car-warriors. Meanwhile, Drona, that foremost of smiters mounting another chariot, proceeded to the gate of the array and stayed there for battle. Then, O king, the angry Bhima of great prowess, covered the car-division in his front with showers of shafts. Then those mighty car-warriors, viz., thy sons, thus struck in battle, endued as they were with great strength fought with Bhima from desire of victory.