Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
वर्णाश्रमाचारयुतं मनुः स्वायंभुवो ऽब्रवीत् / सत्येन ब्रह्मचर्येण श्रुतेन तपसा च वै
varṇāśramācārayutaṃ manuḥ svāyaṃbhuvo 'bravīt / satyena brahmacaryeṇa śrutena tapasā ca vai
Manu Svāyambhuva spoke of the dharma joined to the conduct of varṇa and āśrama—through truth, brahmacarya, śruti (the Veda), and tapas, indeed.