Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
इत्यादिलक्षणं श्रौतं धर्म सप्तर्षयो ऽब्रुवन् / परंपरागतं धर्म स्मार्त्तं चाचारलक्षणम्
ityādilakṣaṇaṃ śrautaṃ dharma saptarṣayo 'bruvan / paraṃparāgataṃ dharma smārttaṃ cācāralakṣaṇam
Thus the Seven Ṛṣis declared the Śrauta dharma with such marks; and also the Smārta dharma, handed down through lineage, distinguished by ācāra—right conduct.