Matsya Purana — Catalogue of the Eighteen Puranas
ब्रह्मविष्ण्वर्करुद्राणां माहात्म्यं भुवनस्य च ससंहारप्रदानां च पुराणे पञ्चवर्णके //
brahmaviṣṇvarkarudrāṇāṃ māhātmyaṃ bhuvanasya ca sasaṃhārapradānāṃ ca purāṇe pañcavarṇake //
In a Purāṇa described under five headings, it is taught: the greatness of Brahmā, Viṣṇu, Arka (the Sun), and Rudra; the account of the worlds; and the themes of dissolution (saṃhāra) and renewed creation.
It explicitly includes saṃhāra (dissolution) and restoration/re-creation among the core Purāṇic topics, placing pralaya within the standard fivefold Purāṇa framework.
Indirectly, it frames what a Purāṇa is meant to teach—divine greatness and cosmic order—knowledge that underpins dharma-based governance and household conduct, even though no specific royal/household duty is stated here.
No direct Vāstu or temple-rule detail appears in this verse; its ritual takeaway is definitional—Purāṇas are authoritative sources that also contain ritual and cosmological instruction within their fivefold scope.