Shiva Purana
मूर्तिमंतमथावाह्य यजेत्परमकारणम् ॥ स्नानार्थे कल्पयेत्तत्र पञ्चगव्यं तु कापिलम् ॥ २५ ॥
Then one should call upon the idolized Lord and worship Him who is the supreme cause. Five kinds of cow's milk and Kapila should be offered there for bathing.
english translation
mUrtimaMtamathAvAhya yajetparamakAraNam ॥ snAnArthe kalpayettatra paJcagavyaM tu kApilam ॥ 25 ॥
hk transliteration by Sanscript