1 Thessalonians 2:1
For you know, brethren, our coming unto you, that it was not in vain:
1 Corinthians 15:2
by which you are also saved; which word I preached to you, if you hold it fast, otherwise you believed in vain.
1 Corinthians 15:10
But by the grace of God I am what I am: and his grace was not vain toward me; but I have labored more abundantly than they all: and not I, but the grace of God with me.
1 Corinthians 15:58
So, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, knowing that your labor is not in vain in the Lord.
2 Corinthians 6:1
But working together we indeed intreat you not to have received the grace of God in vain:
Galatians 2:2
but I went up according to revelation; and I presented to them the gospel which I am preaching among the Gentiles, but privately to the prominent ones, lest perhaps I am running, or did run, in vain.
Philippians 2:16
having the word of life; unto my boasting in the day of Christ, because I did not run in vain, neither did I labor in vain.
1 Thessalonians 1:3-10
incessantly remembering your work of faith and labor of love and patience of hope of our Lord Jesus Christ, before God even our Father;
1 Thessalonians 2:13
And on account of this we also give thanks to God incessantly, because, receiving the word of God from us by hearing, you received it not as the word of men, but, as it truly is, the word of God, who indeed works in you who believe.
1 Thessalonians 3:5
Therefore I indeed, no longer containing, sent that I might know your faith, lest perhaps the tempter tempted you, and our labor may be in vain.
2 Thessalonians 1:10
when he may come to be glorified among his saints, and among all those who believe, to be wondered at in that day, because our testimony was believed by you.
2 Thessalonians 3:1
Finally, brethren, pray for us in order that the word of the Lord may run and be glorified, as even unto you: