Acts 16:8-10

so passing by Mysia, they went down to Troas. Then a vision appeared to Paul in the night: a man from [the Roman province of] Macedonia was standing and pleading with him, saying, “Come over to Macedonia and help us!” And when he had seen the vision, we (including Luke) tried to go on into Macedonia at once, concluding that God had called us to preach the gospel to them.