Om Namah Shivaya is at the guts in the Vedas and Tantras (historical Scriptures) and finds its mention within the Yajurveda within the Shri Rudram hymn. Perceived to become most efficient if, from the observe of Japa Yoga, wherever the mantra is repeated verbally or mentally 108 times a day https://fatallisto.com/story8555851/little-known-facts-about-10-most-powerful-mantra