Shiva Purana
अतिगुह्यमिदम्विप्राः प्रणवार्थप्रकाशकम् ॥ शिवज्ञानपरं ह्येतद्भवतामार्तिनाशनम् ॥ ४९ ॥
O brahmins, this is a great secret. It illuminates the meaning of the Praṇava. Leading to the knowledge of Śiva it destroys all your miseries.
english translation
atiguhyamidamviprAH praNavArthaprakAzakam ॥ zivajJAnaparaM hyetadbhavatAmArtinAzanam ॥ 49 ॥
hk transliteration by Sanscript