Shiva Purana
ब्रह्मादिस्थावरान्तानां सर्वेषां प्राणिनां खलु ॥ प्राणः प्रणव एवायं तस्मात्प्रणव ईरितः ॥ १४ ॥
Praṇava is the vital breath of all living beings from Brahmā to immobile beings. Being the Prāṇa thus, it is called Praṇava.
english translation
brahmAdisthAvarAntAnAM sarveSAM prANinAM khalu ॥ prANaH praNava evAyaM tasmAtpraNava IritaH ॥ 14 ॥
hk transliteration by Sanscript