Mahabharata 12.193.28
ब्रह्मोवाचमहास्मृतिं पठेद्यस्तु तथैवानुस्मृतिं शुभाम्तावप्येतेन विधिना गच्छेतां मत्सलोकताम्
brahmovācamahāsmṛtiṃ paṭhedyastu tathaivānusmṛtiṃ śubhāmtāvapyetena vidhinā gacchetāṃ matsalokatām
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book