Acts 16:7-10

7After they were come to Mysia, they assayed to go into Bithynia: but the Spirit suffered them not.

8And they passing by Mysia came down to Troas.

9And a vision appeared to Paul in the night; There stood a man of Macedonia, and prayed him, saying, Come over into Macedonia, and help us.

10And after he had seen the vision, immediately we endeavoured to go into Macedonia, assuredly gathering that the Lord had called us for to preach the gospel unto them.