Shiva Purana
नन्दीकेशं च यश्चैव पूजयेत्परया मुदा ॥ नित्यं तस्याखिला सिद्धिर्भविष्यति न संशयः ॥ १२॥
If one worships Nandikeśa with great devotion one will certainly achieve all Siddhis.
english translation
nandIkezaM ca yazcaiva pUjayetparayA mudA ॥ nityaM tasyAkhilA siddhirbhaviSyati na saMzayaH ॥ 12॥
hk transliteration by Sanscript