'Shadow' in the Bible

The place where they serve is a sketch and shadow of the heavenly sanctuary, just as Moses was warned by God as he was about to complete the tabernacle. For he says, "See that you make everything according to the design shown to you on the mountain."

For the law possesses a shadow of the good things to come but not the reality itself, and is therefore completely unable, by the same sacrifices offered continually, year after year, to perfect those who come to worship.