The Catechism in Questions & Answers

453. What are the duties of the apostolate?

Jesus Christ gave the Apostles the commission “to loose and to bind” (Matthew 18: 18), in other words, to pronounce something as permissible or forbidden. Thereby the doctrine is established and order is created in the congregations.
In accordance with the example of Jesus, the Apostles are servants (cf. John 13: 15). They are not lords over the faith of the congregations, but rather fellow workers for their joy (cf. 2 Corinthians 1: 24), and are to be examples to the congregation in following Christ (cf. 1 Corinthians 11: 1).