Shiva Purana
इदं रहस्यम्परमं प्रतिष्ठितमतस्त्वयि ॥ त्वमपि श्रद्धया भक्त्या प्रणवेष्वेव सादरम् ॥ ४६ ॥
This is the supreme mystery of my established opinion in you. You too, with faith and devotion, are respectfully engaged in the oṁkāras.
english translation
idaM rahasyamparamaM pratiSThitamatastvayi ॥ tvamapi zraddhayA bhaktyA praNaveSveva sAdaram ॥ 46 ॥
hk transliteration by Sanscript