Mbh 8.32.1a

"Sanjaya said, 'Thy son then, O monarch, humbly approaching that mighty car-warrior, viz., the ruler of the Madras, addressed him, from affection, in these words, "O thou of true vows, O thou of great good fortune, O enhancer of the sorrows of foes, O ruler of the Madras, O hero in battle, O thou that inspirest hostile troops with fear, thou hast heard, O foremost of speakers, how, for the sake of Karna who spoke unto me, I myself am desirous of soliciting thee among all these lions of kings. O thou of incomparable prowess, O king of the Madras, for the destruction of the foe, I solicit thee today, with humility and bow of the head. Therefore, for the destruction of Partha and for my good, it behoveth thee, O foremost of car-warriors, to accept, from love, the office of charioteer. With thee for his driver, the son of Radha will subjugate my foes. There is none else for holding the reins of Karna's steeds, except thee, O thou of great good fortune, thou that art the equal of Vasudeva in battle. Protect Karna then by every means like Brahma protecting Maheswara. Even as he of Vrishni's race protects by every means the son of Pandu in all dangers, do thou, O chief of the Madras, protect the son of Radha today. Bhishma, and Drona, and Kripa, and thyself and the valiant ruler of the Bhojas, and Shakuni the son of Subala, and Drona's son and myself, constituted the chief strength of our army. Even thus, O lord of Earth, we had divided amongst ourselves the hostile army into portions for the share of each. The share that had been allotted to Bhishma is now no more as also that which had been allotted to the high-souled Drona. Going even beyond their allotted shares, those two slew my foes. Those two tigers among men, however, were old, and both of them have been slain deceitfully. Having achieved the most difficult feats, both of them, O sinless one, have departed hence to heaven.