Yudhishthira said Arjuna had said that he would consume all our enemies in a single day. Proud of his heroism, he did not, however, do what he had said. Hence has he fallen down.
युधिष्ठिर उवाच एकाह्रा निर्दहेयं वै शत्रूनित्यर्जुनोऽब्रवीत्। न च तत् कृतवानेष शूरमानी ततोऽपतत्॥