Anandakanda 1.2.140

1.2.140

tāmrabaddhaṃ ramāvāṇīkuberendrajalādhipāḥ /
kāntabaddhaṃ yamamarunnairṛtāḥ samapūjayan //

Ramā, Vāṇī, Kubera, Indra, and the Lord of Waters [worshipped that] bound with copper.
Yama, the Wind, and Nirṛti worshipped that bound with lodestone;