Matsya Purana — Characteristics of Dvāpara and Kali Yugas
यथा कृतयुगे पूर्वम् एकवर्णमभूत्किल तथा कलियुगस्यान्ते शूद्रीभूताः प्रजास्तथा //
yathā kṛtayuge pūrvam ekavarṇamabhūtkila tathā kaliyugasyānte śūdrībhūtāḥ prajāstathā //
Just as it is said that in the former Kṛta Yuga there was a single social order (one varṇa), so too, at the end of the Kali Yuga, the people likewise become as though reduced to the condition of Śūdras.
This verse is not about cosmic dissolution (pralaya); it describes yuga-lakṣaṇa—how society transforms across ages, especially the moral and social leveling said to occur toward the end of Kali.
By portraying end-of-Kali social degradation, it implies a king’s duty to protect dharma, education, and social stability, and a householder’s duty to uphold conduct (ācāra), truthfulness, and responsible livelihood even when standards decline.
No direct vastu/temple-architecture rule is stated here; the verse functions as a diagnostic marker of the age, which indirectly frames why puranic ritual discipline and dharmic regulation are emphasized in Kali.