Matsya Purana — Yadu Lineage
कस्य त्वं सुभगे का वा दुःखिते मयि दुःखिता महता तपसा युक्ता किमर्थं मां निषेवसे //
kasya tvaṃ subhage kā vā duḥkhite mayi duḥkhitā mahatā tapasā yuktā kimarthaṃ māṃ niṣevase //
O beautiful one, whose are you—or who indeed are you? Since I am afflicted, you too seem afflicted. Endowed with great austerity, for what purpose do you attend upon me?
Indirectly, it reflects the Pralaya-era mood of distress and seeking refuge: Manu, in sorrow, encounters a tapasvinī whose presence and service raise questions about purpose and destiny amid crisis.
It highlights discernment (viveka) and ethical inquiry: a ruler/householder should respectfully ask the identity and intention of one who approaches, especially in times of calamity, while recognizing genuine tapas and compassionate solidarity.
No explicit Vastu or temple-ritual rule appears in this verse; its significance is narrative and ethical—recognizing tapas (austerity) and the intention behind service (niṣevā).