Mbh 8.96.1a

"Sanjaya said, 'After Karna had thus been slain and the Kaurava troops had fled away, he of Dasharha's race, embracing Partha from joy, said unto him these words: "Vritra was slain by thee. Men will talk (in the same breath) of the slaughter of Vritra and Karna in awful battle. Vritra was slain in battle by the deity of great energy with his thunder. Karna hath been slain by thee with bow and sharp arrows. Go, O son of Kunti, and represent, O Bharata, unto king Yudhishthira the just, this prowess of thine that is capable of procuring thee great fame and that hath become well-known in the world. Having represented unto king Yudhishthira the just, this slaughter of Karna in battle for compassing which thou hadst been endeavouring for a long course of years, thou wilt be freed from the debt thou owest to the king. During the progress of the battle between thyself and Karna, the son of Dharma once came for beholding the field. Having, however, been deeply and exceedingly pierced (with arrows), he could not stay in battle. The king, that bull among men, then went back to his tent." Partha answered Keshava, that bull of Yadu's race, saying, "So be it!" The latter then cheerfully caused the car of that foremost of car-warriors to turn back. Having said these words unto Arjuna, Krishna addressed the soldiers, saying, "Blessed be ye, stand all of you carefully, facing the foe!" Unto Dhrishtadyumna and Yudhamanyu and the twin sons of Madri and Vrikodara and Yuyudhana, Govinda said, "Ye kings, until we come back having informed the king of Karna's slaughter by Arjuna, stand ye here with care." Having received the permission of these heroes, he then set out for the quarters of the king. With Partha in his company, Govinda beheld Yudhishthira, that tiger among kings, lying on an excellent bed of gold. Both of them then, with great joy, touched the feet of the king.