True Founder of the Law of Conservation of Energy

According to the humans of this present world, the founder of ?1st law of conservation of energy? is given by scientists like Albert Einstein, Julius Mayer and Emilie du Chatelet (in French) but in the book named ?BHAGVAT GITA?, on adhyay 4, shlok 6 (part 4, para 6) it is encrypted with energy as god. that book was narrated in 3rd century BC by Maharshi Vyas (the book is old enough than the year on which the laws given by the mentioned scientists above. but the year was given by archeologists).