Shiva Purana
उक्तेष्वेतेषु लिंगेषु पार्थिवं लिंगमुत्तमम् । तस्य पूजनतो विप्रा बहवः सिद्धिमागताः ४ ।
The Earthly phallic image of Śiva is the most excellent of all such images of Śiva. Many brahmins have achieved great things by worshipping it.
english translation
ukteSveteSu liMgeSu pArthivaM liMgamuttamam । tasya pUjanato viprA bahavaH siddhimAgatAH 4 ।
hk transliteration by Sanscript