1 Thessalonians 2:16

2:16 because they hinder us from speaking to the Gentiles so that they may be saved. Thus they constantly fill up their measure of sins, but wrath has come upon them completely.

1 Thessalonians 3:5

3:5 So when I could bear it no longer, I sent to find out about your faith, for fear that the tempter somehow tempted you and our toil had proven useless.