Skandapurana 5.265.4

5.265.4

kapāleśvamanyacca caturthaṃ parikīrtitam..
ekaikaṃ sarvaliṃgānāṃ phalaṃ yacchatyasaṃśayam..
yathoktavidhinā samyagyathoktaṃ dvijasattamāḥ..4..

and Kapāleśvara is proclaimed as the fourth. / Each one gives the fruit of all liṅgas without a doubt, / when properly [worshipped] according to the prescribed rule, as has been said, O best of twice-born ones.