Skandapurana 16.14.3

16.14.3

ke maṃtrāḥ kiṃ vidhānaṃ tu keṣu parvasu pūjayet..
jaigīṣavyeśvaro bhūtvā hyabhūtsiddheśvaraḥ katham ..
tanme kathaya deveśa vistarātsarvameva hi .. 3 ..

What are the mantras, and what is the procedure? On what lunar occasions should one worship? / How did [the liṅga] that was Jaigīṣavyeśvara become Siddheśvara? / Tell me all of that in detail, O lord of gods.