The earliest recorded utilization of mantras is found in the Vedic scriptures of Hinduism, which contain quite a few references on the sacredness of sound. These Hindu texts explain speech by itself for a goddess (often called "Vac") and praise her electric power and potency. (especially in Hinduism and Buddhism) https://durga56532.tinyblogging.com/the-greatest-guide-to-mantra-74878782