The Vedas, the sacred texts of Hinduism, have been the 1st book to mention them. Yantras have been in the beginning applied as being a Software for ritual worship and later on turned connected with a mystical diagram and magical spell. The Bija Mantras are also referred to as mantras https://claytonyfhlo.blogproducer.com/47005238/the-basic-principles-of-beej-mantra