Galatians 4:11
I fear for you, lest I may have bestowed upon you labor in vain.
1 Thessalonians 3:5
For this cause, when I too could no longer forbear, I sent in order to know your faith, lest by some means the tempter might have tempted you, and our labor should prove in vain.
Galatians 2:2
And I went up by revelation, and communicated to them that gospel which I preach among the gentiles; but privately to those who were of reputation, lest by any means I should run, or had run, in vain.
Acts 16:6
And having gone through Phrygia and the Galatian country, on being forbidden by the Holy Spirit to preach the word in Asia,
1 Corinthians 15:58
Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, since ye know that your labor is not in vain in the Lord.
2 Corinthians 11:2-3
For I am jealous over you with a godly jealousy; for I espoused you to one husband, to present you as a pure virgin to Christ;
2 Corinthians 12:20-21
For I fear, lest, when I come, I shall not find you such as I would, and lest I too shall be found by you such as ye would not; lest there be wranglings, envying, wraths, rivalries, backbitings, whisperings, swellings, tumults;
Galatians 4:20
I could wish indeed to be present with you now, and to change my tone, for I am in perplexity about you.
Galatians 5:2-4
Behold, I Paul say to you, that if ye are circumcised, Christ will profit you nothing;
Philippians 2:16
holding forth the word of life, that I may have whereof to boast against the day of Christ, that I did not run in vain, or labor in vain.
2 John 1:8
Look to yourselves, that ye lose not the things which ye wrought, but receive a full reward.