Om Namah Shivaya is at the center with the Vedas and Tantras (historic Scriptures) and finds its mention inside the Yajurveda from the Shri Rudram hymn. Perceived to be most successful if, while in the observe of Japa Yoga, where the mantra is repeated verbally or mentally 108 instances daily https://prxdirectory.com/listings13075555/fascination-about-10-most-powerful-mantra