The Church at Antioch had a great blessing to have prophets and teachers - at least five listed here! From that pool of workers, the Holy Spirit chose Saul and Barnabas for another work according to his calling. Throughout the New Testament, prophet and teacher are offices of great respect. Paul himself wrote later on that we should procure the best gifts, among them prophecy. Teaching and prophesying are highly regarded because through them the Word of God is explained for the conversion of souls and the edification of the church. A healthy church should institute ways to build up new prophets and teachers.
It is worth noting from the list of teachers and prophets that Antioch was a multi-ethnic church and not bound by partiality. Saul and Barnabas were Jews; Simeon and Lucius were black people from North Africa; and Manaen seemed to be well connected with the upper class in Rome. All of them worshiped together and worked together for the kingdom of God. The Church must be free from partiality and become an open community of Christ to make an impact in the world. Though there were many tendencies to separate Jew from Gentile and Greek from Roman due to socio-econo-political reasons, the Church fought against those tendencies to establish a Church that is united in its diversity.
Since the Church is guided by the Holy Spirit, it makes only sense that the Church is constantly seeking him in worship, fasting, and prayer. These are the basic disciplines of the deeper life in Christ. If I am to grow as a Christian, I must learn to worship, fast and pray. Notice that it is not a personal spiritual practice in this context. The Church at Antioch was devoted to these spiritual disciplines as a congregation. I must learn to worship, fast, and pray with my brothers and sisters as a concerted effort to seek his direction for the whole church. The Holy Spirit speaks to his church in an environment of worship, fasting, and prayer. How devoted am I to these disciplines? Moreover, how committed am I to practice them in unity with my brothers and sisters in the church?
The sendoff of Saul and Barnabas was the result of a church committed to seek the guidance of the Spirit in worship, fasting, and prayer. The fact that there is an imposition of hands for this sendoff tells us that the elders of the church were behind it. It also tells us that there is a process by which workers are recognized to be sent out to the field; there is a hierarchy; there is order. The expansion of God's kingdom depends on our willingness to send workers out into the field. I have to shift from the "us four and no more" paradigm to an open-fisted one, willing to send workers to the field under the guidance and direction of the Spirit.