1 Thessalonians 2:1
For you yourselves know, brothers, that my visit to you did not fail of its purpose;
1 Corinthians 15:2
by which also you are saved, if you are holding fast the message which I preached to you; unless indeed you have believed in vain.
1 Corinthians 15:10
But by the grace of God I am what I am, and that grace of his, bestowed upon me, did not prove ineffectual. I labored more abundantly than all the rest, yet not I, but by the grace of God that is with me.
1 Corinthians 15:58
So, my brothers beloved, stand firm, immovable, always abounding in work for the Lord, because you know that your toil is not fruitless in the Lord.
2 Corinthians 6:1
As a worker with him I beseech you not to receive the grace of God in vain.
Galatians 2:2
(I went up at that time in obedience to a revelation). And I laid before them the gospel which I am wont to preach among the Gentiles. I did this privately before those in authority, lest by any means I should be running, or should already have run, in vain.
Galatians 4:11
I am alarmed about you for fear lest I may have bestowed labor on you to no purpose.
Philippians 2:16
holding out a message of life. Thus it will be my boast at the day of Christ that I have not run in vain, or toiled for nothing.
1 Thessalonians 1:3-10
as I call to mind your work of faith, and labor of love, and patience of hope in our Lord Jesus Christ, in the presence of our God and Father.
1 Thessalonians 2:13
For this reason also I am giving continual thanks to God, because when you heard from me the spoken word of God, you received it not as the word of men, but as the word of God (which in truth it is), who himself is effectually at work in you believe.
1 Thessalonians 3:5
So, when I could no longer endure it, I sent to find out about your faith, fearing that the tempter had tempted you and that my labor had been in vain.
2 Thessalonians 1:10
when he comes to be glorified in his saints, and to be wondered at in all believers, on that Day; (for you also believed our testimony).
2 Thessalonians 3:1
Finally, brothers, pray on for me, that God's word may run swiftly, and be glorified as in your own case,