Cross reference
Philippians 4:16
16 for even in Thessalonica ye sent once and again unto my need.
1 Thessalonians 2:9
9 For ye remember, brethren, our labor and travail: working night and day, that we might not burden any of you, we preached unto you the gospel of God.
Acts 17:1
1 Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where was a synagogue of the Jews:
1 Thessalonians 2:18
18 because we would fain have come unto you, I Paul once and again; and Satan hindered us.