1 Thessalonians 3:5

For this reason, when I could endure it no longer, I also sent to find out about your faith, for fear that the tempter might have tempted you, and our labor would be in vain.

Matthew 4:3

And the tempter came and said to him, "If you are the Son of God, command these stones to become loaves of bread."

Philippians 2:16

holding fast the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain.

1 Corinthians 7:5

Do not deprive one another, except by agreement for a time, so that you may devote yourselves to prayer, and then come together again so that Satan will not tempt you because of your lack of self-control.

Galatians 2:2

I went up because of a revelation; and I set before them the gospel that I preach among the Gentiles. But I did this privately to those who were of reputation, for fear that I was running or had run my race in vain.

1 Thessalonians 3:1-2

Therefore when we could endure it no longer, we thought it best to be left behind at Athens alone,

Acts 15:36

After some days Paul said to Barnabas, "Let us return and visit the brethren in every city where we proclaimed the word of the Lord, and see how they are."

2 Corinthians 2:11

in order that Satan might gain no advantage over us; for we are not ignorant of his schemes.

2 Corinthians 7:5-7

For even when we came into Macedonia, our flesh had no rest, but we were afflicted at every turnconflicts on the outside and fears within.

2 Corinthians 11:2-3

I am jealous for you with a godly jealousy; for I betrothed you to one husband, so that to Christ I might present you as a pure virgin.

2 Corinthians 11:13-15

For such men are false apostles, deceitful workmen, disguising themselves as apostles of Christ.

Galatians 1:6-9

I am astonished that you are so quickly deserting him who called you by the grace of Christ and turning to a different gospel

Galatians 4:11

I fear for you, that perhaps I have labored over you in vain.

Ephesians 4:14

As a result, we are no longer to be children, tossed here and there by waves and carried about by every wind of doctrine, by the cunning of men, by their craftiness in deceitful scheming.

1 Thessalonians 2:1

For you yourselves know, brethren, that our visit to you was not in vain;

1 Thessalonians 3:6

But now that Timothy has come to us from you, and has brought us the good news of your faith and love and reported that you always remember us kindly and long to see us, just as we long to see you

James 1:13-14

Let no one say when he is tempted, "I am being tempted by God"; for God cannot be tempted by evil, and he himself does not tempt anyone.

Treasury of Scripture Knowledge

Summary

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.

Bible References

I sent

1 Thessalonians 3:2
and we sent Timothy, our brother and God's fellow worker in the gospel of Christ, to strengthen and encourage you in your faith,
Acts 15:36
After some days Paul said to Barnabas, "Let us return and visit the brethren in every city where we proclaimed the word of the Lord, and see how they are."
2 Corinthians 7:5
For even when we came into Macedonia, our flesh had no rest, but we were afflicted at every turnconflicts on the outside and fears within.

And our

1 Thessalonians 2:1
For you yourselves know, brethren, that our visit to you was not in vain;
Galatians 2:2
I went up because of a revelation; and I set before them the gospel that I preach among the Gentiles. But I did this privately to those who were of reputation, for fear that I was running or had run my race in vain.
Galatians 4:11
I fear for you, that perhaps I have labored over you in vain.
Philippians 2:16
holding fast the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain.