Saṃkhyāvarta (संख्यावर्त्त): Commencement of Yajña at the Dawn of Tretāyuga
प्रतिष्ठितायां वार्त्तायां गृहश्रमपरेषु च / वर्णाश्रमव्यवस्थानं कृत्वा मन्त्रांस्तु संहतान्
pratiṣṭhitāyāṃ vārttāyāṃ gṛhaśramapareṣu ca / varṇāśramavyavasthānaṃ kṛtvā mantrāṃstu saṃhatān
When livelihood (husbandry and trade) had become established and people were devoted to the labors of household life, the order of varṇa and āśrama was set in place, and the mantras were gathered into a compendium.