Shiva Purana
॥ वामदेव उवाच ॥ ॐ नमः प्रणवार्थाय प्रणवार्थविधायिने ॥ प्रणवाक्षरबीजाय प्रणवाय नमोनमः ॥ २२॥
Vāmadeva said:— Om, obeisance to the meaning of the Praṇava, to the enterpreter of the Praṇava, to the Bīja of the letters of the Praṇava.
english translation
॥ vAmadeva uvAca ॥ OM namaH praNavArthAya praNavArthavidhAyine ॥ praNavAkSarabIjAya praNavAya namonamaH ॥ 22॥
hk transliteration by Sanscript