The apostles are ambassadors sent by Christ's authority to represent him and complete specific tasks (see Matthew 10:1–8, 40; 28:16–20). The term apostle also refers to Paul (Galatians 1:1).
first Simon, called Peter: Peter was the first apostle chosen by Jesus (Matthew 4:18–22; 16:17–19). He served as the leader of the apostles (see 19:27; 26:33; Acts 2:14).