Read 1 Thessalonians 3:5 Using Other Translations
For this cause, when I could no longer forbear, I sent to know your faith, lest by some means the tempter have tempted you, and our labour be in vain.
For this reason, when I could bear it no longer, I sent to learn about your faith, for fear that somehow the tempter had tempted you and our labor would be in vain.
That is why, when I could bear it no longer, I sent Timothy to find out whether your faith was still strong. I was afraid that the tempter had gotten the best of you and that our work had been useless.