Matsya Purana — Brahmā–Gāyatrī as a Divine Pair and the Early Genealogies of Creation
परस्परं च सम्बन्धः सगोत्राणाम् अभूत् कथम् वैवाहिकस्तत्सुतानां छिन्द्धि मे संशयं विभो //
parasparaṃ ca sambandhaḥ sagotrāṇām abhūt katham vaivāhikastatsutānāṃ chinddhi me saṃśayaṃ vibho //
How did mutual relationships arise among those of the same lineage (sagotra)? And how did marital alliance come about for their sons? O Lord, dispel my doubt.
This verse does not describe pralaya directly; it reflects post-creation social ordering—how lineages (gotras) and kin-relations became structured after the emergence of human/ancestral lines.
It points to dharma-based clarity on kinship and marriage eligibility—knowledge essential for householders arranging marriages and for kings regulating social order through accepted lineage and alliance norms.
No Vastu or temple-architecture rule is stated here; the verse is genealogical/social, focusing on gotra relations and marriage alliances rather than ritual construction procedures.