1 Thessalonians 3:5-6

5For this reason, when I could no longer endure the suspense, I sent someone to find out about your faith [how you were holding up under pressure], for fear that somehow the tempter had tempted you and our work [among you] would prove to be ineffective.

6But now that Timothy has come back to us from [his visit with] you, and has brought us good news of your [steadfast] faith and [the warmth of your] love, and [reported] that you always think kindly of us and treasure your memories of us, longing to see us just as we long to see you,