Mbh 8.79.4b

So also, in Virata's city, moving on a single car he vanquished all of us, and snatched from us that wealth of kine, and took from all the foremost of car-warriors (portions of) their garments. Challenging that foremost of Kshatriyas, that hero having him of Vrishni's race for his ally, that warrior who is endued with such energy and such attributes, I regard myself, O Shalya, to be the foremost of persons in all the world in point of courage. He is, again, protected by that Keshava of great energy, who is Narayana himself and who is without a rival, that high-souled Vasudeva, that ever-victorious Vishnu armed with conch, discus, and mace, whose attributes all the world united together, cannot (in narrating) exhaust in 10,000 years. Beholding the two Krishnas together on the same car, fear entereth my heart together with courage. Partha is the foremost of all bowmen, while Narayana is unrivalled in encounters with the discus. Even such are Vasudeva, and the son of Pandu. Indeed, the mountains of Himavat may move from the spot where they stand but not the two Krishnas. Both of them are heroes, possessed of great skill, firm in the use of weapons, and mighty car-warriors. Both of them have adamantine frames. Who else, O Shalya, save myself, would proceed against Phalguna and Vasudeva that are even such? The desire cherished by me today, viz., that of a battle with the son of Pandu, O ruler of the Madras, will be fulfilled without delay. Soon will that wonderful and matchless and beautiful battle take place. Either I will overthrow those two in battle today, or the two Krishnas will today overthrow me." Saying these words unto Shalya, Karna, that slayer of foes, began to utter loud roars in that battle, like those of the clouds.