Matsya Purana — Manvantaras
धर्मो धर्मगतिः प्रोक्तः शब्दो ह्येष क्रियात्मकः कुशलाकुशलौ चैव धर्माधर्मौ ब्रवीत्प्रभुः //
dharmo dharmagatiḥ proktaḥ śabdo hyeṣa kriyātmakaḥ kuśalākuśalau caiva dharmādharmau bravītprabhuḥ //
Dharma is declared to be the course, the guiding path of righteousness; this term is indeed action-oriented. The Lord explains that what is wholesome and what is unwholesome are called, respectively, dharma and adharma.
This verse does not discuss pralaya directly; it defines dharma in practical terms—dharma and adharma are known through wholesome versus unwholesome actions, a framework meant to guide conduct across all cosmic phases.
It frames duty as action-based: a king or householder should judge policies and daily conduct by whether they are kuśala (beneficial, welfare-producing, stabilizing) or akuśala (harmful, disordering), treating the former as dharma and the latter as adharma.
No specific Vāstu or ritual procedure is named; however, the verse supplies a rule of interpretation used in ritual and temple-building ethics—actions that are beneficial, orderly, and non-harmful align with dharma, while harmful deviations align with adharma.