Shiva Purana
तत्त्वादिभूतपर्यन्तं शरीरादिष्वतन्द्रितः ॥ व्याप्याधितिष्ठति शिवस्ततो रुद्र इतस्ततः ॥ ३७ ॥
Śiva pervades all living beings, the principles and elements. He is wakefully present in the bodies and presides over them. Hence he is called Viṣṇu.
english translation
tattvAdibhUtaparyantaM zarIrAdiSvatandritaH ॥ vyApyAdhitiSThati zivastato rudra itastataH ॥ 37 ॥
hk transliteration by Sanscript