Matsya Purana — Prayaga Mahatmya: Trimurti Presence
माहेश्वरो वटो भूत्वा तिष्ठते परमेश्वरः ततो देवाः सगन्धर्वाः सिद्धाश्च परमर्षयः रक्षन्ति मण्डलं नित्यं पापकर्मनिवारणात् //
māheśvaro vaṭo bhūtvā tiṣṭhate parameśvaraḥ tato devāḥ sagandharvāḥ siddhāśca paramarṣayaḥ rakṣanti maṇḍalaṃ nityaṃ pāpakarmanivāraṇāt //
Having become the Maheśvara-vaṭa (Śiva’s sacred banyan), the Supreme Lord abides there. Therefore the gods, together with the Gandharvas, the Siddhas, and the great seers, continually protect that holy maṇḍala, for it averts sinful deeds.
It does not describe Pralaya directly; it emphasizes a sacred, stabilized divine presence (Parameśvara as the Maheśvara-vaṭa) and the ongoing protection of a holy maṇḍala that removes sin.
It supports dharmic conduct by highlighting that association with protected sacred precincts (maṇḍala/kshetra) and reverence for such sites aids pāpa-nivṛtti; rulers and householders are thereby encouraged to protect temples/tīrthas and uphold ritual purity.
The key term is maṇḍala—understood as a consecrated ritual/temple precinct or protective sacred circle—whose sanctity is guarded by divine beings; this aligns with Puranic-Vāstu ideas of maintaining a pure, ritually defended sacred zone.