Om Namah Shivaya is at the center on the Vedas and Tantras (historical Scriptures) and finds its mention from the Yajurveda inside the Shri Rudram hymn. Perceived to be most productive if, from the follow of Japa Yoga, where the mantra is repeated verbally or mentally 108 times every day https://youtube.com/shorts/CeBSHFfmcrE