Acts 16:9-10

9 During the night Paul had a vision: there stood a man of Macedonia pleading with him and saying, "Come over to Macedonia and help us."
10 When he had seen the vision, we immediately tried to cross over to Macedonia, being convinced that God had called us to proclaim the good news to them.

Acts 16:9-10 In-Context

7 When they had come opposite Mysia, they attempted to go into Bithynia, but the Spirit of Jesus did not allow them;
8 so, passing by Mysia, they went down to Troas.
9 During the night Paul had a vision: there stood a man of Macedonia pleading with him and saying, "Come over to Macedonia and help us."
10 When he had seen the vision, we immediately tried to cross over to Macedonia, being convinced that God had called us to proclaim the good news to them.
11 We set sail from Troas and took a straight course to Samothrace, the following day to Neapolis,
12 and from there to Philippi, which is a leading city of the district of Macedonia and a Roman colony. We remained in this city for some days.