Matsya Purana — Saubhagya-Śayana Vow: Lalitā/Gaurī–Śiva Worship
इदमिह मदनेन पूर्वमिष्टं शतधनुषा कृतवीर्यसूनुना च कृतमथ वरुणेन नन्दिना वा किम् उ जननाथ ततो यदुद्भवः स्यात् //
idamiha madanena pūrvamiṣṭaṃ śatadhanuṣā kṛtavīryasūnunā ca kṛtamatha varuṇena nandinā vā kim u jananātha tato yadudbhavaḥ syāt //
This account here was earlier desired/approved by Madana, and it was also brought about by Śatadhanu, the son of Kṛtavīrya; or else it was done by Varuṇa, or by Nandin. O Lord of beings, from whom, then, would the origin of this line truly arise?
This verse does not describe Pralaya; it focuses on clarifying a disputed or multi-sourced origin of a person/lineage, listing alternative agents (Madana, Śatadhanu, Varuṇa, Nandin) and asking which is the true source.
Indirectly, it reflects a kingly concern central to Rajadharma and vaṁśa-tradition: establishing legitimate lineage and reliable historical memory. In Purāṇic polity, clarity of ancestry supports rightful succession and social order.
No Vāstu or temple-ritual rule is stated in this verse; it is a genealogical/narrative question about causation and parentage/origin.