The Earliest recorded usage of mantras is present in the Vedic scriptures of Hinduism, which have many references into the sacredness of audio. These Hindu texts explain speech by itself for a goddess (known as "Vac") and praise her energy and potency. The mantras are drawn in the Vairocanābhisaṃbodhi Sūtra. https://www.instagram.com/tantramantraaurvigyaan/