 In Rabbinic Judaism, Kohanim, members of the hereditary caste that served as priests in the time of the Temple, are mostly restricted from entering grave sites and touching dead bodies.During the Temple period, such priests (Kohanim) were required to eat their bread offering (Terumah) in a state of ritual purity, which laws eventually led to more rigid laws being enacted, such as hand-washing which became a requisite of all Jews before consuming ordinary bread.An important subcategory of the ritual purity laws relates to the segregation of menstruating women.