Mbh 7.147.2a

“Sanjaya said, ‘After Bhimasena had been made carless, that hero, afflicted with the wordy darts of Karna and filled with rage, addressed Phalguna and said, “In thy very sight, O Dhananjaya, Karna hath repeatedly said to me, ‘Eunuch, fool, glutton, unskilled in weapons, do not fight, child, unable to bear the burden of battle!’ He that would tell me so would be slain by me. Karna hath told me those words, O Bharata! O mighty-armed one, thou knowest the vow which I have made jointly with thee. Remember the words that were then spoken by me. O foremost of men, act in such a way that that vow of mine, O son of Kunti, as also thy own vow, may not be falsified. O Dhananjaya, do that by which that vow of mine may be made true.” Hearing these words of Bhima, Arjuna of immeasurable prowess, getting near Karna in that battle, told him, “O Karna, thou art of false fight. O son of a Suta, thou applaudest thy own self. Of wicked understanding, listen now to what I tell thee. Heroes meet with either of these two things in battle, viz., victory or defeat. Both of these are uncertain, O son of Radha! The case is not otherwise when Indra himself is engaged in battle. Made carless by Yuyudhana, with thy senses no longer under thy control, thou wert almost at the point of death. Remembering, however, that I had vowed to slay thee, that hero dismissed thee without taking thy life. It is true thou hadst succeeded in depriving Bhimasena of his car. Thy abuse, however, O son of Radha, of that hero was sinful. Those bulls among men that are truly righteous and brave, having vanquished a foe, never boast, nor speak ill of anybody. Thy knowledge, however, is little. It is for this, O son of a Suta, that thou indulged in such speeches. Then again the abusive epithets thou didst apply to the battling Bhimasena, endued with great prowess and heroism and devoted to the practices of the righteous, were not consistent with truth.