Matsya Purana — Characteristics of Dvāpara and Kali Yugas
एवंविधाश्च ये केचिद् भवन्तीह कलौ युगे अधीयते तदा वेदाञ् छूद्रा धर्मार्थकोविदाः //
evaṃvidhāśca ye kecid bhavantīha kalau yuge adhīyate tadā vedāñ chūdrā dharmārthakovidāḥ //
Thus, people of such kinds—whoever they may be—arise here in the Kali age; and then even Śūdras study the Vedas and become proficient in dharma and artha, righteous duty and practical welfare.
This verse is not about pralaya; it describes a Kali-yuga condition—changes in who studies the Vedas and who becomes skilled in dharma and artha.
It signals that in Kali-yuga, social and educational norms shift; a king or householder should focus on sustaining dharma and practical welfare (artha) through right instruction and governance rather than relying only on inherited status.
No vastu/temple-architecture rule is stated here; the verse concerns Vedic study and competence in dharma-artha rather than ritual procedure or building canons.