Mahabharata 12.230.14
त्रेतादौ सकला वेदा यज्ञा वर्णाश्रमास्तथासंरोधादायुषस्त्वेते व्यस्यन्ते द्वापरे युगे
tretādau sakalā vedā yajñā varṇāśramāstathāsaṃrodhādāyuṣastvete vyasyante dvāpare yuge
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book