Matsya Purana — Catalogue of the Eighteen Puranas
त्रिविक्रमस्य माहात्म्यम् अधिकृत्य चतुर्मुखः त्रिवर्गमभ्यधात्तच्च वामनं परिकीर्तितम् //
trivikramasya māhātmyam adhikṛtya caturmukhaḥ trivargamabhyadhāttacca vāmanaṃ parikīrtitam //
Taking up the greatness of Trivikrama as his theme, the Four-faced Lord (Brahmā) expounded the three aims of life; and in that very context the incarnation of Vāmana was celebrated.
This verse does not discuss pralaya directly; it frames a teaching context where Brahmā highlights the trivarga while recounting the Vāmana–Trivikrama glory.
By foregrounding the trivarga (dharma, artha, kāma), it points to the classical Purāṇic ethic: prosperity and pleasure are to be pursued under the governance of dharma—an organizing principle for both kingship and household life.
No direct Vāstu or temple-ritual rule appears in this verse; its ritual takeaway is devotional—Vāmana/Trivikrama is to be remembered and praised within dharma-oriented instruction.