The regulative principle of worship is a Christian doctrine, held by some Calvinists and Anabaptists, that God commands churches to conduct public services of worship using certain distinct elements affirmatively found in scripture, and conversely, that God prohibits any and all other practices in public worship. The doctrine further determines these affirmed elements to be those set forth in scripture by express commands or examples, or if not expressed, those which are implied logically by good and necessary consequence. The regulative principle thus provides a governing concept of worship as obedience to God, identifies the set of specific practical elements constituting obedient worship, and identifies and excludes disobedient practices.