Mahabharata 12.326.123

यो ह्यस्माकं गुरुः श्रेष्ठः कृष्णद्वैपायनो मुनिःस जगौ परमं जप्यं नारायणमुदीरयन्

yo hyasmākaṃ guruḥ śreṣṭhaḥ kṛṣṇadvaipāyano muniḥsa jagau paramaṃ japyaṃ nārāyaṇamudīrayan

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