Mahabharata 12.257.1

भीष्म उवाच · bhīṣma uvāca

अत्राप्युदाहरन्तीममितिहासं पुरातनम्प्रजानामनुकम्पार्थं गीतं राज्ञा विचख्नुना

atrāpyudāharantīmamitihāsaṃ purātanamprajānāmanukampārthaṃ gītaṃ rājñā vicakhnunā

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