Matsya Purana — Mahāgaurī’s Entry
करुणाहास्यबीभत्सकिंचित्किंचिद्धरो ऽभवत् जिघांसुर्देववाक्येन भैरवं कृतवान्वपुः //
karuṇāhāsyabībhatsakiṃcitkiṃciddharo 'bhavat jighāṃsurdevavākyena bhairavaṃ kṛtavānvapuḥ //
Then Hara (Śiva) became of a mixed demeanor—partly compassionate, partly laughing, and partly terrible. Wishing to slay (the offender), and at the bidding of the gods, he assumed the body-form of Bhairava.
This verse is not about pralaya; it highlights a theophany—Śiva’s deliberate assumption of a fierce form (Bhairava) to restore order at the gods’ request.
It frames righteous punishment: even divine power acts under dharmic purpose—protecting cosmic order and restraining wrongdoing—mirroring a king’s duty to punish proportionately for social stability.
No explicit Vāstu rule appears, but the verse is iconographic: it supports Bhairava as a legitimate worship-form of Śiva, relevant to temple imagery, protective shrine placement, and Bhairava-oriented rites in Purāṇic practice.