Matsya Purana — Saptamī Sacred Bath and the Mṛtavatsābhiṣeka Rite for Pacifying Misfortune an...
काञ्चनीं च ततः कुर्यात् ताम्रपात्रोपरिस्थिताम् प्रतिमां धर्मराजस्य गुरवे विनिवेदयेत् //
kāñcanīṃ ca tataḥ kuryāt tāmrapātroparisthitām pratimāṃ dharmarājasya gurave vinivedayet //
Then one should have a golden image made—placed upon a copper vessel—and formally present that image of Dharmarāja (Yama) to one’s teacher (guru).
This verse does not address pralaya; it focuses on dāna-dharma—ritual gifting—specifically the prescribed offering of a Dharmarāja image to the guru.
It prescribes a meritorious act of giving: commissioning a properly prepared icon and offering it to one’s guru, reflecting the householder/kingly duty to support religious authority and uphold dharma through sanctioned donations.
The ritual detail is technical: the golden pratimā is to be set upon a copper vessel (tāmra-pātra), indicating a prescribed material and placement protocol for icon-donation rites.