The Vedas, the sacred texts of Hinduism, have been the first e book to mention them. Yantras ended up at first used like a Device for ritual worship and later on turned related to a mystical diagram and magical spell. To Lakshmi: oṃ śrīṃ hrīṃ śrīṃ kamale kamalālaye prasīda prasīda; https://www.youtube.com/@Mahavidyabaglamukhi