Matsya Purana — Brahmā–Gāyatrī as a Divine Pair and the Early Genealogies of Creation
विद्याधराधिपत्यं च यावद् आभूतसंप्लवम् सुखानि धर्मतः प्राप्य मत्समीपं गमिष्यसि //
vidyādharādhipatyaṃ ca yāvad ābhūtasaṃplavam sukhāni dharmataḥ prāpya matsamīpaṃ gamiṣyasi //
You will attain sovereignty over the Vidyādharas until the cosmic dissolution of beings; having gained joys in accordance with dharma, you will then come into My presence (near Matsya).
It frames pralaya as an all-beings dissolution/inundation (ābhūta-saṃplava) and states that Manu’s bestowed status lasts only until that cosmic endpoint, after which he approaches the deity (Matsya).
It links legitimate enjoyment and authority to dharma—sukha is to be “obtained through righteousness,” implying that rulership and prosperity are sanctioned when aligned with ethical conduct and sacred order.
No direct Vāstu/temple-building rule is stated; the verse is primarily soteriological and royal—promising divinely granted sovereignty and eventual approach to the deity rather than prescribing ritual or architectural procedure.