'Shadow' in the Bible

who serve a sketch and shadow of the heavenly [things], just as Moses was warned [when he] was about to complete the tabernacle, for he says, "See to it that you make everything according to the pattern which was shown to you on the mountain."

For the law, possessing a shadow of the good [things] that are about to come, not the form of things itself, [is] never able {year by year} by means of the same sacrifices which they offer without interruption to make perfect those who draw near.