Tibetan Book of the Dead (also translated as The Great Liberation Through Hearing in Bardo), which was written by Guru Padma-sambhava in the 12th century, describes in detail the ways in which the human soul leaves the body after death. This process is called bardo in Tibetan.
西藏佛教中，八世紀由蓮花生大師所講述的《西藏度亡經》（又譯為《中陰聞教得度》）便詳細記載了意識在臨終與死亡時出脫肉體的過程，藏語稱「過程」為 bardo，被譯為「中陰」。