"The Aquarian Gospel of Jesus the Christ" by Levi H. Dowling is a book published in 1908. Dowling claimed to have transcribed this text from the akashic records, a mystical compendium of knowledge existing on a non-physical plane. The work fills the eighteen "missing years" of Jesus's life between ages twelve and thirty, depicting his travels to India, Tibet, Persia, Greece, and Egypt, where he studies with religious teachers. It presents Jesus as an exemplar of human potential, incorporates reincarnation and karma, and heralds the coming Aquarian Age.
Wikipedia page about this book: en.wikipedia.org/wiki/The_Aquarian_Gospel_of_Jesus_the_Christ