Pastor Rockhill opens the first four verses of Acts 13, where the gospel's advance from Jerusalem reaches the thriving church at Antioch. His central burden is to show how God calls, confirms, and sends laborers into His harvest, and how this pattern establishes the ordered, accountable life of Christ's church. Pastor Rockhill walks through the leaders gathered at Antioch—Barnabas, Simeon, Lucius, Menaen, and Saul—noting that the gospel was now crossing geographical, ethnic, and social barriers in fulfillment of God's promise to Abraham. He stresses that Antioch was no independent congregation but was organically and doctrinally connected to Jerusalem, the seed of what would become Presbyterian government and the Jerusalem Council of Acts 15. The key doctrine concerns the call to office. As the leaders ministered to the Lord in worship and fasting, the Holy Spirit set apart Barnabas and Saul. Pastor Rockhill distinguishes the inward sense of call from the outward call of the church, which tests and confirms it, and he explains the laying on of hands as consecration, delegation of Christ's authority, and public accountability. By way of application, he commends fasting as a fitting means of seeking the Lord, warns against self-appointed ministry, and urges believers to value the God-ordained structures that guard both the flock and its officers. Through these appointed means the gospel still spreads and the church is built, all to the praise of God's glory alone.