Mahabharata 13.77.4

भीष्म उवाच · bhīṣma uvāca

तस्मै प्रोवाच वचनं प्रणताय हितं तदागवामुपनिषद्विद्वान्नमस्कृत्य गवां शुचिः

tasmai provāca vacanaṃ praṇatāya hitaṃ tadāgavāmupaniṣadvidvānnamaskṛtya gavāṃ śuciḥ

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