To be sensitive and responsive to the needs of the traditional Jewish family and community, it is important to understand the origin and the source of those special needs. Biblical law is clear about the requirement for immediate burial; "You must bury it (the body) on the same day" (Deut. 21:23). Jewish law therefore requires immediate burial. From this also derives the requirement for the entire body to be brought to burial, including all internal organs, even the blood, which is associated with the souls as it carries the life force through the body (See: Deut. 12:23).
There are many sources for the belief that while the soul or spirit leaves the body upon death, it is nevertheless aware and conscious of its surroundings, particularly the body, until after its return to the earth. The dignity and the respect accorded the remains is therefore significant. Any invasive procedure if seen as a desecration. Any delay in the burial and anything other than the burial of the entire body is seen as painful to the spirit and is contrary to Jewish law.