Matsya Purana — Characteristics of Dvāpara and Kali Yugas
एवं क्षयं गमिष्यन्ति ह्य् अल्पशिष्टाः प्रजास्तदा तासामल्पावशिष्टानाम् आहारादृद्धिरिष्यते //
evaṃ kṣayaṃ gamiṣyanti hy alpaśiṣṭāḥ prajāstadā tāsāmalpāvaśiṣṭānām āhārādṛddhiriṣyate //
Thus, the remaining creatures will indeed go to ruin; and then, for those who are left in only small number, their increase will be said to arise from food (i.e., by the availability of sustenance).
It describes a phase of dissolution/decline where beings become few and approach ruin, followed by a practical mechanism of recovery: whatever survivors remain grow again when sustenance (āhāra) becomes available.
By implication, it highlights āhāra (food supply) as foundational for social continuity—supporting the king’s duty to protect agriculture and distribution, and the householder’s duty to produce and share food through righteous livelihood and hospitality.
No direct Vāstu or temple-ritual rule is stated; the takeaway is indirect—ritual order and settlement stability depend on reliable food systems, which are prerequisites for sustaining communities after periods of decline.