Acts 16:6-10

And Paul and Silas passed through the territory of Phrygia and Galatia, having been forbidden by the Holy Spirit to proclaim the Word in [the province of] Asia. And when they had come opposite Mysia, they tried to go into Bithynia, but the Spirit of Jesus did not permit them. So passing by Mysia, they went down to Troas. [There] a vision appeared to Paul in the night: a man from Macedonia stood pleading with him and saying, Come over to Macedonia and help us! And when he had seen the vision, we [including Luke] at once endeavored to go on into Macedonia, confidently inferring that God had called us to proclaim the glad tidings (Gospel) to them.