Shiva Purana
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इहोन्नमः शिवायेति मंत्रेणानेन सिद्धयः ॥ स तस्मादधिगंतव्यः परावरविभूतये ॥ ५६ ॥
The Siddhis are achieved by the mantra, ‘Oṃ Namaḥ Sivāya’. Hence the mantra shall be acquired for the acquisition of the great magnificence which has nothing parallel to it.
english translation
ihonnamaH zivAyeti maMtreNAnena siddhayaH ॥ sa tasmAdadhigaMtavyaH parAvaravibhUtaye ॥ 56 ॥
hk transliteration by Sanscript