Shiva Purana
अन्तःपुराधिपं साक्षान्नन्दिनं सम्यगर्चयेत् ॥ चामीकराचलप्रख्यं सर्वाभरणभूषितम् ॥ १६ ॥
One should worship the Lord of the inner palace, Nandi, directly. It was like a mountain of gold and adorned with all kinds of ornaments.
english translation
antaHpurAdhipaM sAkSAnnandinaM samyagarcayet ॥ cAmIkarAcalaprakhyaM sarvAbharaNabhUSitam ॥ 16 ॥
hk transliteration by Sanscript