Skandapurana 1.4.11.149

1.4.11.149

iṃdranīlamayaṃ vahnirnāma viśveśvaraṃ japan..
puṣparāgaṃ guruliṃgaṃ viśvayoniṃ japanharam.. 13.149 ..

Agni, a liṅga of sapphire, reciting the name “Lord of the Universe”;
Bṛhaspati, a topaz liṅga, reciting Hara's name “Womb of the Universe”;