Mbh 8.56.3f

Crowds of Siddhas and Charanas began to repair to that spot from every side, mentally uttering this prayer, viz., "Let good be to all the worlds." Never before, O king, did I see prowess like that of Drona's son in that battle while he was engaged in shrouding the two Krishnas with shafts. The sound of Ashvatthama's bow, inspiring foes with terror, was repeatedly heard by us in that battle, O king, to resemble that of a roaring lion. While careering in that battle and striking right and left the string of his bow looked beautiful like flashes of lightning in the midst of a mass of clouds. Though endued with great firmness and lightness of hand the son of Pandu, for all that, beholding the son of Drona then, became greatly stupefied. Indeed, Arjuna then regarded his own prowess to be destroyed by his high-souled assailant. The form of Ashvatthama became such in that battle that men could with difficulty gaze at it. During the progress of that dreadful battle between Drona's son and the Pandava, during that time when the mighty son of Drona, O monarch, thus prevailed over his antagonist and the son of Kunti lost his energy, Krishna became filled with rage. Inspired with wrath he drew deep breaths, O king, and seemed to burn with his eyes both Ashvatthama and Phalguna as he looked at them repeatedly. Filled with rage, Krishna addressed Partha in an affectionate tone, saying, "This, O Partha, that I behold in battle regarding thee, is exceedingly strange, since Drona's son, O Partha, surpasseth thee today! Hast thou not now the energy and the might of thy arms thou hadst before? Hast thou not that Gandiva still in thy hands, and dost thou not stay on thy car now? Are not thy two arms sound? Hath thy fist suffered any hurt? Why is it then that I see the son of Drona prevail over thee in battle? Do not, O Partha, spare thy assailant, regarding him as the son of thy preceptor, O bull of Bharata's race. This is not the time for sparing him."