Lord’s Day 31, Chapter 1: The Keys of the Kingdom of Heaven

Q. 83. What are the keys of the kingdom of heaven? A. The preaching of the holy gospel, and Christian discipline, or excommunication out of the Christian church; by these two, the kingdom of heaven is opened to believers, and shut against unbelievers. Q. 84. How is the kingdom of heaven opened and shut by the preaching of the holy gospel? A. Thus: when according to the command of Christ, it is declared and publicly testified to all and every believer, that, whenever they receive the promise...