Om Namah Shivaya is at the heart on the Vedas and Tantras (historic Scriptures) and finds its mention while in the Yajurveda during the Shri Rudram hymn. Perceived to become most powerful if, from the practice of Japa Yoga, in which the mantra is repeated verbally or mentally 108 occasions https://youtube.com/shorts/CeBSHFfmcrE