The biblical passage that makes reference to the “keys of the kingdom” isMatthew 16:19. Jesus had asked His disciples who people thought He was. After responding with several of the more popular opinions, Jesus aimed His question directly at His disciples. Peter, responding for the twelve, acknowledged Jesus as the Christ, the Son of the Living God. After this great confession, Jesus replied:
“Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven. And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it. I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven” (Matthew 16:17-19).
Keys are used to lock or unlock doors. The specific doors Jesus has in mind in this passage are the doors to the Kingdom of Heaven. Jesus is laying the foundation of His church (Ephesians 2:20). The disciples will be the leaders of this new institution called the church, and Jesus is giving them the authority to either grant or bar access to the Kingdom. The authority of the keys is to open and shut the doors to the Kingdom of Heaven. Precisely how do the keys to the kingdom work? Biblically speaking, how does one enter the Kingdom of Heaven?
Jesus tells us that unless one is born again, he will not see the Kingdom of Heaven (John 3:3). One is born again as the Holy Spirit works through the Word of God to bring about new life in dead sinners. So the faithful preaching of the gospel is one of the keys to the kingdom. The other key is church discipline. In Matthew 18:15-20, Jesus gives us the guidelines for church discipline. He specifically mentions in that passage the same “binding and loosing” language we find in Matthew 16. Similarly, in 1 Corinthians 5:1-13, Paul urges the Corinthian church to ex-communicate the man caught in adultery. Church discipline was considered by the Protestant Reformers as one of the marks of a true church (along with the preaching of the pure gospel and the administration of the sacraments).