The Catechism in Questions & Answers

457. What is the foundation of the Chief Apostle ministry?

The foundation of the Chief Apostle ministry is the commission that Jesus gave when He instituted the office of Peter. Jesus said the following to Simon Peter: “You are Peter, and on this rock I will build My church, and the gates of Hades shall not prevail against it. And I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven” (Matthew 16: 18, 19).

The “office of Peter” is the fundamental office that Jesus Christ assigned to Apostle Peter. The Petrine office incorporates the care of those who belong to the church, just as Jesus asked Peter to do: “Feed My lambs [...] Tend My sheep”. The “authority of the keys” is also part of the office of Peter (concerning this, see Questions 458).