Shiva Purana
आदिमध्यांतनिर्मुक्तस्स्वभावविमलः प्रभुः ॥ सर्वज्ञः परिपूर्णश्च शिवो ज्ञेयश्शिवागमे ॥ १८ ॥
Śiva is devoid of beginning, middle and end. He is the lord innately pure, omniscient and perfect as mentioned in Śaivite Āgamas.
english translation
AdimadhyAMtanirmuktassvabhAvavimalaH prabhuH ॥ sarvajJaH paripUrNazca zivo jJeyazzivAgame ॥ 18 ॥
hk transliteration by Sanscript