Mbh 14.82.1b

Though Partha who was capable of shooting the bow with the left hand (as well as with the right) spared the body of the prince of Magadha, yet the latter thinking that his body was protected by his own prowess, shot many arrows at Partha. The wielder of Gandiva, deeply struck by the prince of Magadha, shone like a flowering Palasa (Butea frondosa) in the season of spring. Arjuna had no desire of slaying the prince of Magadha. It was for this that, having struck the son of Pandu, he succeeded in remaining before that foremost of heroes. Then Dhananjaya, becoming angry, drew his bow with great force, and slew his antagonist's steeds and then struck off the head of his car-driver. With a razor-headed shaft he then cut off Meghasandhi's large and beautiful bow, and then his leathern fence. Then cutting off his flag and flag-staff, he caused it to fall down. The prince of Magadha, exceedingly afflicted, and deprived of his steeds and bow and driver, took up a mace and rushed with great speed at the son of Kunti. Arjuna then with many shafts of his equipt with vulturine feathers cut off into fragments, that mace of his advancing foe which was adorned with bright gold. Thus cut off into fragments, that mace with its begemmed bonds and knots all severed, fell on the Earth like a she-snake helplessly hurled down by somebody. When his foe became deprived of his car, his bow, and his mace, that foremost of warriors, viz., the intelligent Arjuna, did not wish to strike him. The ape-bannered hero then, comforting his cheerless foe who had been observant of Kshatriya duties, said unto him these words, "O son, thou hast sufficiently displayed thy adherence to Kshatriya duties. Go now. Great have been the feats, O king, which thou hast accomplished in battle although thou art very young in years. The command I received from Yudhishthira was that kings who oppose me should not be slain. It is for this thou livest yet, O monarch, although thou hast offended me in battle."