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