Mahabharata 12.26.13

अत्राप्युदाहरन्तीममितिहासं पुरातनम्गीतं राज्ञा सेनजिता दुःखार्तेन युधिष्ठिर

atrāpyudāharantīmamitihāsaṃ purātanamgītaṃ rājñā senajitā duḥkhārtena yudhiṣṭhira

Our plain-language meaning of this verse is waiting for scholar review.