Mahabharata 12.327.4

एतं नः संशयं विप्र छिन्धि गुह्यं सनातनम्त्वया नारायणकथा श्रुता वै धर्मसंहिता

etaṃ naḥ saṃśayaṃ vipra chindhi guhyaṃ sanātanamtvayā nārāyaṇakathā śrutā vai dharmasaṃhitā

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