Matsya Purana — Ritual Procedure and Merit of Donating the Ratnācala
यस्माद्रत्नप्रदानेन तुष्टिं प्रकुरुते हरिः सदा रत्नप्रदानेन तस्मान्नः पाहि पर्वत //
yasmādratnapradānena tuṣṭiṃ prakurute hariḥ sadā ratnapradānena tasmānnaḥ pāhi parvata //
Since Hari (Viṣṇu) is ever pleased by the gift of gems, therefore, O Parvata, protect us—who are devoted to the giving of jewels.
This verse does not address pralaya directly; it focuses on dāna (charitable giving), stating that Hari is pleased by gem-donation and that such piety is linked with divine protection.
It reinforces the Purāṇic duty of dāna: a king or householder should give valuable gifts (here, gems) as a meritorious act that pleases Vishnu and is believed to invite welfare and protection for oneself and one’s community.
No explicit Vāstu or temple-architecture rule appears here; the ritual takeaway is the devotional framing of ratna-dāna as a Vaiṣṇava act that pleases Hari and is accompanied by a prayer for protection.