Meaning
Our Lord gave them the "keys of the kingdom," and by the gift of his Spirit fitted them to be the founders and governors of his church (John 14:16, 17, 26; 15:26, 27; 16:7-15). To them, as representing his church, he gave the commission to "preach the gospel to every creature" (Matt 28:18-20). After his ascension he communicated to them, according to his promise, supernatural gifts to qualify them for the discharge of their duties (Acts 2:4; 1Cor 2:16; 2:7, 10, 13; 2Cor 5:20; 1Cor 11:2). Judas Iscariot, one of "the twelve," fell by transgression, and Matthias was substituted in his place (Acts 1:21). Saul of Tarsus was afterwards added to their number (Acts 1:9-20; 20:4; 26:15-18; 1Tim 1:12; 2:7; 2Tim 1:11).
Luke has given some account of Peter, John, and the two Jameses (Acts 12:2, 17; 15:13; 21:18), but beyond this we know nothing from authentic history of the rest of the original twelve. After the martyrdom of James the Greater (Acts 12:2), James the Less usually resided at Jerusalem, while Paul, "the apostle of the uncircumcision," usually travelled as a missionary among the Gentiles (Gal 2:8). It was characteristic of the apostles and necessary (1) that they should have See n the Lord, and been able to testify of him and of his resurrection from personal knowledge (John 15:27; Acts 1:21, 22; 1Cor 9:1; Acts 22:14, 15). (2.) They must have been immediately called to that office by Christ (Luke 6:13; Gal 1:1). (3.) It was essential that they should be infallibly inspired, and thus secured against all error and mistake in their public teaching, whether by word or by writing (John 14:26; 16:13; 1Thess 2:13).
(4.) Another qualification was the power of working miracles (Mark 16:20; Acts 2:43; 1Cor 12:8-11). The apostles therefore could have had no successors. They are the only authoritative teachers of the Christian doctrines. The office of an apostle ceased with its first holders.
In 2Cor 8:23 and Phil 2:25 the word "messenger" is the rendering of the same Greek word, elsewhere rendered "apostle."