Mahabharata 3.78.16

वैशंपायन उवाच · vaiśaṃpāyana uvāca

ततो हृष्टमना राजा बृहदश्वमुवाच हभगवन्नक्षहृदयं ज्ञातुमिच्छामि तत्त्वतः

tato hṛṣṭamanā rājā bṛhadaśvamuvāca habhagavannakṣahṛdayaṃ jñātumicchāmi tattvataḥ

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