Shiva Purana
असंख्यातास्सहस्राणि सिद्धाः सिद्धिं गतास्ततः ॥ सिद्धलिंगमिति ख्यातन्तस्माद्वीरेश्वरम्परम् ॥ २८ ॥
Innumerable thousands of Siddhas have derived the fulfilment of their desire from the worship of Śiva. Hence Vīreśa is famous as the Fruit-yielding phallic image.
english translation
asaMkhyAtAssahasrANi siddhAH siddhiM gatAstataH ॥ siddhaliMgamiti khyAtantasmAdvIrezvaramparam ॥ 28 ॥
hk transliteration by Sanscript