Shiva Purana
जगत्त्रयीसर्जनार्थं शंकरं नीललोहितम् ॥ ललाटेऽचिन्तयत्सोयन्तपस्युग्रे च संस्थितः ॥ ४१ ॥
Remaining in a severe penance, he contemplated on Śiva, the blue-necked, in his forehead for the creation of the three worlds.
english translation
jagattrayIsarjanArthaM zaMkaraM nIlalohitam ॥ lalATe'cintayatsoyantapasyugre ca saMsthitaH ॥ 41 ॥
hk transliteration by Sanscript