"If a soul commit a trespass, and sin through ignorance, in the holy things of the Lord." (Leviticus 5:15)
The "shadow of things to come" (Colossians 2:17) in the Old Testament focuses on physical items and places that were considered especially holy and dedicated.
In the New Testament, however, the "holy things" were focused on the eternal and spiritual holiness that was merely "shadowed" by the earlier ceremonies. Our "holy calling" (2 Timothy 1:9) is granted through our "holy faith" (Jude 1:20). God has designed us to become "a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light" (1 Peter 2:9).
While we serve the Lord on this earth, we are "sealed with that holy Spirit of promise" (Ephesians 1:13), expecting that the Lord will make us "to increase and abound in love one toward another, and toward all men.… To the end he may stablish your hearts unblameable in holiness before God" (1 Thessalonians 3:12-13).
Jerusalem on earth, destroyed and rebuilt throughout history, is the prototype of "the holy city, new Jerusalem, coming down from God out of heaven" wherein "the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God" (Revelation 21:2-3). HMM III