Cross reference
Philippians 4:16
16 Because even in Thessalonica you sent once and again to me in my need.
1 Thessalonians 2:9
9 For you have the memory, my brothers, of our trouble and care; how, working night and day, so that we might not be a trouble to any of you, we gave you the good news of God.
Acts 17:1
1 Now when they had gone through Amphipolis and Apollonia they came to Thessalonica, where there was a Synagogue of the Jews:
1 Thessalonians 2:18
18 For which reason we made attempts to come to you, even I, Paul, once and again; but Satan kept us from coming.