Om Namah Shivaya is at the guts from the Vedas and Tantras (historical Scriptures) and finds its mention from the Yajurveda while in the Shri Rudram hymn. Perceived to get most helpful if, from the follow of Japa Yoga, wherever the mantra is recurring verbally or mentally 108 times each https://phrasedirectory.com/listings13077176/the-10-most-powerful-mantra-diaries