Mahabharata 12.128.5

भीष्म उवाच · bhīṣma uvāca

गुह्यं मा धर्ममप्राक्षीरतीव भरतर्षभअपृष्टो नोत्सहे वक्तुं धर्ममेनं युधिष्ठिर

guhyaṃ mā dharmamaprākṣīratīva bharatarṣabhaapṛṣṭo notsahe vaktuṃ dharmamenaṃ yudhiṣṭhira

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