The Law of One, a set of channeled transcripts by an entity named Ra (in congruency to the sun god Ra of Egyptian times) proclaiming to be three levels of densities, or major evolutions, ahead of our own as humans.

Great read whether it sticks around as a belief for you or not, akin to any other religious text in my opinion.

Can be read for free at lawofone.info

Definitely read the intro before jumping into the meat of it for the great context provided by the L/L Research team for what comes after.