Shiva Purana
ॐमितीदं सर्वमिति श्रुतिराह सनातनी ॥ तस्माद्वेतीत्युपक्रम्य जगत्सृष्टिः प्रक्रीर्तिता ॥ ५२ ॥
The eternal Śruti says “Om is this all.” Beginning with “verily from it”, the creation of the universe is glorified.
english translation
OMmitIdaM sarvamiti zrutirAha sanAtanI ॥ tasmAdvetItyupakramya jagatsRSTiH prakrIrtitA ॥ 52 ॥
hk transliteration by Sanscript