Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
हंसकुक्कुटवक्त्राश्च व्यादितास्या भयावहाः सिंहास्या लेलिहानाश्च काकगृध्रमुखास्तथा //
haṃsakukkuṭavaktrāśca vyāditāsyā bhayāvahāḥ siṃhāsyā lelihānāśca kākagṛdhramukhāstathā //
Some bore the faces of swans and cocks; others, with gaping mouths, were terrifying. Some had lion faces with tongues lolling out, and others had the faces of crows and vultures as well.
This verse does not describe cosmic creation or pralaya directly; it catalogs fear-inducing hybrid faces as ominous manifestations, typically used in Purāṇic narration to signal disorder, danger, or inauspicious conditions.
Such descriptions function as warnings: a king or householder is expected to respond to inauspicious signs with restraint, protection of dependents, and corrective rites (śānti/pravṛtti toward dharma), rather than panic or adharma.
While no building rule is stated, the imagery aligns with śānti-ritual logic used alongside Vāstu/temple contexts: terrifying, inauspicious forms are treated as indicators for pacificatory rites and purification before or during major undertakings.