Jesus appointed some to be Apostles, some Prophets, some Evangelists and some Pastors and Teachers:
For the perfecting of the saints,
For the work of the ministry,
For the edifying of the body of Christ.
Eph. 4:11-12
Definition: Apostle
Delegate. Especially an ambassador of the Gospel, officially a commissioner of Christ represented by and limited in number by the 12 foundations of New Jerusalem (Strong’s Abridged) S-S.org