Shiva Purana
नीलग्रीवाय मंत्रेण नमःपूर्वेण भक्तिमान् । चरेच्छंकरलिंगस्य प्रतिष्ठापनमुत्तमम् १४ ।
The excellent installation of the phallic image of Śiva shall be made devoutly with the mantra “Namaḥ Nīla-grīvāya॥ 7॥” (obeisance to the blue-necked).
english translation
nIlagrIvAya maMtreNa namaHpUrveNa bhaktimAn । carecchaMkaraliMgasya pratiSThApanamuttamam 14 ।
hk transliteration by Sanscript