Skandapurana 1.3.15.65

1.3.15.65

āraṇyācchataguṇaṃ puṇyamarcitaṃ pārvataṃ yathā..
pārvatāccaiva liṃgācca phalaṃ cāyutasaṃjñitam..
tapovanāśritaṃ liṃgaṃ pūjitaṃ vā mahāphalam.. 17.65 ..

Worshipping [a liṅga] on a mountain yields a hundredfold the merit of a forest [liṅga]; / and from a mountain liṅga, the fruit is termed ten thousandfold; / or a liṅga worshipped in a hermitage yields great fruit.