Matsya Purana — Division of Bhārata-varṣa
ब्राह्मणाः क्षत्रिया वैश्या मध्ये शूद्राश्च भागशः इज्यायुतवणिज्यादि वर्तयन्तो व्यवस्थिताः //
brāhmaṇāḥ kṣatriyā vaiśyā madhye śūdrāśca bhāgaśaḥ ijyāyutavaṇijyādi vartayanto vyavasthitāḥ //
Brahmins, Kshatriyas, and Vaishyas—and, in due proportion among them, Shudras as well—were duly established in the central region, each carrying on their respective functions such as yajña (ritual service), allied occupations, trade, and related livelihoods.
This verse is not about Pralaya; it describes the organized establishment of social groups (varnas) and their customary livelihoods, emphasizing order and proportional distribution in society.
It supports Rajadharma by implying that a king should maintain a stable social order where different groups perform their appropriate occupations—ritual service, protection/administration, trade, and service—so the realm functions harmoniously.
The explicit ritual term is 'ijyā' (sacrifice/worship), indicating the place of yajña and worship as recognized societal functions; it does not directly prescribe Vastu or temple-building rules in this verse.