1 Thessalonians 1:8

1:8 For from you the message of the Lord has echoed forth not just in Macedonia and Achaia, but in every place reports of your faith in God have spread, so that we do not need to say anything.

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.