Matsya Purana — Vishnu’s Battle with the Daityas: Astra-Combat
तान्यस्त्राणि प्रयुक्तानि शरीरं विविशुर्हरेः गुरूक्तान्युपदिष्टानि सच्छिष्यस्य श्रुताविव //
tānyastrāṇi prayuktāni śarīraṃ viviśurhareḥ gurūktānyupadiṣṭāni sacchiṣyasya śrutāviva //
Those missiles, once discharged, entered into Hari’s body—just as teachings spoken by a guru, when properly imparted, enter and settle in the hearing of a worthy disciple.
This verse is not about pralaya; it uses a didactic metaphor to show Hari’s supreme power—missiles merge into him rather than destroying him, implying divine transcendence over destructive forces.
It indirectly teaches discipline and right receptivity: just as a worthy disciple properly receives a guru’s instruction, a king or householder should receive counsel (śāstra and elders’ guidance) with humility and steadiness rather than reacting with uncontrolled force.
No Vāstu or temple-ritual rule is stated here; the key takeaway is the guru–śiṣya transmission model, which also underlies correct ritual learning (mantra/vidhi) in Purāṇic practice.