New Revised Standard Version
For this reason, when I could bear it no longer, I sent to find out about your faith; I was afraid that somehow the tempter had tempted you and that our labor had been in vain.

Contemporary English Version
At last, when I could not wait any longer, I sent Timothy to find out about your faith. I hoped Satan had not tempted you and made all our work useless.

New American Bible
For this reason, when I too could bear it no longer, I sent to learn about your faith, for fear that somehow the tempter had put you to the test and our toil might come to nothing.

Douay-Rheims Bible
For this cause also, I, forbearing no longer, sent to know your faith: lest perhaps he that tempteth should have tempted you: and our labour should be made vain.

For this cause also, I, forbearing no longer, sent to know your faith: lest perhaps he that tempteth should have tempted you: and our labour should be made vain.

when.

1 Thessalonians 3:1 For which cause, forbearing no longer, we thought it good to remain at Athens alone.

I sent.

1 Thessalonians 3:2,6 And we sent Timothy, our brother and the minister of God in the gospel of Christ, to confirm you and exhort you concerning your faith: . . .

Acts 15:36 And after some days, Paul said to Barnabas: Let us return and visit our brethren in all the cities wherein we have preached the word of the Lord, to see how they do.

2 Corinthians 7:5-7 For also, when we were come into Macedonia, our flesh had no rest: but we suffered all tribulation. Combats without: fears within. . . .

lest.

Matthew 4:3 And the tempter coming said to him: If thou be the Son of God, command that these stones be made bread.

1 Corinthians 7:5 Defraud not one another, except, perhaps, by consent, for a time, that you may give yourselves to prayer: and return together again, lest Satan tempt you for your incontinency.

2 Corinthians 2:11 That we be not overreached by Satan. For we are not ignorant of his devices.

2 Corinthians 11:2,3,13-15 For I am jealous of you with the jealousy of God. For I have espoused you to one husband, that I may present you as a chaste virgin to Christ. . . .

Galatians 1:6-9 I wonder that you are so soon removed from him that called you into the grace of Christ, unto another gospel. . . .

Ephesians 4:14 That henceforth we be no more children tossed to and fro and carried about with every wind of doctrine, by the wickedness of men, by cunning craftiness by which they lie in wait to deceive.

James 1:13,14 Let no man, when he is tempted, say that he is tempted by God. For God is not a tempter of evils: and he tempteth no man. . . .

and our.

1 Thessalonians 2:1 For yourselves know, brethren, our entrance in unto you, that it was not in vain:

Isaiah 49:4 And I said: I have laboured in vain, I have spent my strength without cause and in vain: therefore my judgment is with the Lord, and my work with my God.

Galatians 2:2 And I went up according to revelation and communicated to them the gospel which I preach among the Gentiles: but apart to them who seemed to be some thing: lest perhaps I should run or had run in vain.

Galatians 4:11 I am afraid of you, lest perhaps I have laboured in vain among you.

Philippians 2:16 Holding forth the word of life to my glory in the day of Christ: because I have not run in vain, nor laboured in vain.