Matsya Purana — Characteristics of Dvāpara and Kali Yugas
द्वापरस्य तु पर्याये पुष्यस्य च निबोधत द्वापरस्यांशशेषे तु प्रतिपत्तिः कलेरथ //
dvāparasya tu paryāye puṣyasya ca nibodhata dvāparasyāṃśaśeṣe tu pratipattiḥ kaleratha //
Now understand the concluding phase of the Dvāpara age and the time marked by Puṣya. When the remaining portion of Dvāpara is exhausted, then indeed begins the advent of the Kali age.
This verse is not describing pralaya directly; it explains cosmic chronology—how Kali begins when the remaining portion of Dvāpara ends—showing the Purana’s framework for time cycles that also contextualize larger dissolutions.
By marking the onset of Kali as a distinct era, it implies that dharma-practice must adapt to changing times; kings and householders are expected to be vigilant about declining virtue and uphold discipline, charity, and righteous governance more intentionally in Kali.
No explicit vāstu or temple rule is stated here; the practical takeaway is calendrical—ritual timing and tradition often rely on yuga and nakṣatra markers (here, Puṣya) used in Purāṇic time-reckoning.