Mahabharata 1.143.14

आपत्सु यो धारयति धर्मं धर्मविदुत्तमःव्यसनं ह्येव धर्मस्य धर्मिणामापदुच्यते

āpatsu yo dhārayati dharmaṃ dharmaviduttamaḥvyasanaṃ hyeva dharmasya dharmiṇāmāpaducyate

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