Mbh 7.158.11a

“‘Duryodhana said, “The preceptor (Drona) always protecteth the sons of Pandu, as if they are his own sons. Thou also always never interferest with those my foes. Or, it may be due to my misfortune, that thy prowess never becometh fierce in battle. This may be due also to thy affection for Yudhishthira or Draupadi. I myself am ignorant of the true reason. Fie on my covetous self, for whose sake all friends, desirous of making me happy, are themselves vanquished and plunged into grief. Except thee, O son of Gotama’s daughter, what foremost of all wielders of weapons of there, what warrior, indeed, equal to Mahadeva himself in battle, that would not, though competent, destroy the foe? O Aswatthaman, be pleased with me and destroy my enemies. Neither the gods nor the Danavas are capable of staying within the range of thy weapons. O son of Drona, slay the Panchalas and the Somakas with all their followers. As regards the rest, we will slay them, protected by thee. Yonder, O Brahmana, the Somakas and the Panchalas, possessed of great fame, are careering amid my troops like a forest-conflagration. O mighty-armed one, check them as also the Kailkeyas, O best of men, else, protected by the diadem-decked (Arjuna), they will annihilate us all. O Aswatthaman, O chastiser of foes, go thither with speed. Whether thou accomplishest it now or afterwards, that feat, O sire, should be accomplished by thee. Thou hast been born, O mighty-armed one, for the destruction of the Panchalas. Putting forth thy prowess, thou shalt make the world destitute of Panchalas. Even thus the reverend ones crowned with (ascetic) success, have said. It will be as they have said. Therefore, O tiger among men, slay the Panchalas with all their followers. The very gods with Vasava at their head are incapable of staying within the range of thy weapons, what need be said then of the Parthas and the Panchalas? These words of mine are true.