Mahabharata 13.57.6

वैशंपायन उवाच · vaiśaṃpāyana uvāca

युधिष्ठिरस्य तद्वाक्यं श्रुत्वा भीष्मो महामनाःपरीक्ष्य निपुणं बुद्ध्या युधिष्ठिरमभाषत

yudhiṣṭhirasya tadvākyaṃ śrutvā bhīṣmo mahāmanāḥparīkṣya nipuṇaṃ buddhyā yudhiṣṭhiramabhāṣata

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