Mahabharata 6.72.19

गुप्तं प्रवीरैर्लोकस्य सारवद्भिर्महात्मभिःयदहन्यत संग्रामे दिष्टमेतत्पुरातनम्

guptaṃ pravīrairlokasya sāravadbhirmahātmabhiḥyadahanyata saṃgrāme diṣṭametatpurātanam

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