Shiva Purana
त्रिजगच्छम्भुना व्याप्तं सदेवासुरमानुषम्॥ अनुग्रहाय लोकानां लिंगरूपेण सत्तमाः॥ १४॥
O excellent ones, the three worlds consisting of the gods, Asuras and human beings are pervaded by Śiva in the form of phallic image for the welfare of the worlds.
english translation
trijagacchambhunA vyAptaM sadevAsuramAnuSam॥ anugrahAya lokAnAM liMgarUpeNa sattamAH॥ 14॥
hk transliteration by Sanscript