sentence: a baraita offers , as justification for the ritual of hand-washing after waking , the belief that a spirit of impurity rests upon each person during the night , and will not leave until the person 's hands are washed , and the zohar argues that body is open to demonic possession during sleep because the soul temporarily leaves the body during it ; the kabbalah argues that death awaits anyone who walks more than four yard from their bed without ablution .