Mahabharata 12.203.9

पुरुषं सनातनं विष्णुं यत्तद्वेदविदो विदुःसर्गप्रलयकर्तारमव्यक्तं ब्रह्म शाश्वतम्तदिदं ब्रह्म वार्ष्णेयमितिहासं शृणुष्व मे

puruṣaṃ sanātanaṃ viṣṇuṃ yattadvedavido viduḥsargapralayakartāramavyaktaṃ brahma śāśvatamtadidaṃ brahma vārṣṇeyamitihāsaṃ śṛṇuṣva me

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