Mahabharata 12.164.1

भीष्म उवाच · bhīṣma uvāca

गिरं तां मधुरां श्रुत्वा गौतमो विस्मितस्तदाकौतूहलान्वितो राजन्राजधर्माणमैक्षत

giraṃ tāṃ madhurāṃ śrutvā gautamo vismitastadākautūhalānvito rājanrājadharmāṇamaikṣata

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