Mahabharata 3.80.21

तं दृष्ट्वा नियमेनाथ स्वाध्यायाम्नायकर्शितम्भीष्मं कुरुकुलश्रेष्ठं मुनिः प्रीतमनाभवत्

taṃ dṛṣṭvā niyamenātha svādhyāyāmnāyakarśitambhīṣmaṃ kurukulaśreṣṭhaṃ muniḥ prītamanābhavat

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