Skandapurana 16.63.5

16.63.5

pūjitaṃ devadaityaiśca bhairaveṇa pratiṣṭhitam ..
yastatpūjayate bhaktyā kārtikyāṃ vidhinā naraḥ ..
niraṃtaraṃ vā ṣaṇmāsaṃ so'bhīṣṭaṃ labhate phalam .. 5 ..

It was worshipped by gods and demons, and established by Bhairava.
The man who worships it with devotion according to rule on the full moon of Kārttika,
or continuously for six months, attains his desired fruit.