Matsya Purana — Dialogue of Aṣṭaka and Yayāti: Exhaustion of Merit
चतुष्पदा द्विपदाः पक्षिणश्च तथाभूता गर्भभूता भवन्ति आख्यातमेतन्निखिलं हि सर्वं भूयस्तु किं पृच्छसि राजसिंह //
catuṣpadā dvipadāḥ pakṣiṇaśca tathābhūtā garbhabhūtā bhavanti ākhyātametannikhilaṃ hi sarvaṃ bhūyastu kiṃ pṛcchasi rājasiṃha //
Thus, the four-footed creatures, the two-footed beings, and the birds likewise come into being as womb-born. I have now explained this entire matter in full—what more do you wish to ask, O lion among kings?
It focuses on creation/classification: it states that quadrupeds, bipeds, and birds are generated as womb-born beings, summarizing a prior explanation of how living species arise.
By addressing Manu as “lion among kings,” the text frames cosmological knowledge as part of royal instruction—encouraging a ruler/householder to govern and live with awareness of the order of creation and the diversity of beings under their protection.
No direct Vāstu or ritual procedure is stated; the verse is primarily a doctrinal summary about the classification of living beings (yoni/garbha).