Rasendrapurana 6.116

Rasendrapurāṇa 6.116

saṃśoṣya vālukāyaṃtre yāmānaṣṭau tataḥ pacet
maṃdamagniṃ tataḥ kuryādādye yāmacatuṣṭaye
tato dvitīyayatnena tīvrarmāgnaṃ prayojayet