Matsya Purana — Characteristics of Dvāpara and Kali Yugas
भूत्वा च न भवन्तीह वेदाः कलियुगे ऽखिलाः उत्सीदन्ते तथा यज्ञाः केवलं धर्महेतवः //
bhūtvā ca na bhavantīha vedāḥ kaliyuge 'khilāḥ utsīdante tathā yajñāḥ kevalaṃ dharmahetavaḥ //
In the Kali Yuga, the Vedas—though they exist—do not remain fully manifest in this world; likewise the sacrificial rites (yajñas) decline, surviving only as means for the maintenance of dharma.
It does not describe pralaya directly; it describes a moral-ritual decline within time (Kali-yuga), where Vedic knowledge and yajñas “sink” and function mainly to preserve dharma rather than flourish in full form.
It implies that in Kali-yuga rulers and householders must prioritize dharma-preserving practice—supporting whatever remains of Vedic learning, sponsoring simplified yet sincere rites, and upholding ethical conduct when full Vedic observance is difficult.
Ritually, it states that yajña declines in Kali-yuga and becomes primarily a support for dharma; it does not give Vastu or temple-building rules in this verse, but it frames why later ages emphasize accessible dharmic observances over elaborate sacrifices.