Galatians 4:11
so that I am afraid for you, least I have indeed bestowed upon you labour in vain.
1 Thessalonians 3:5
For this cause being able to wait no longer, I sent to know the state of your faith, least the tempter should have tempted you, and our labor have been in vain.
Galatians 2:2
But I went up according to a divine revelation, and laid before them the gospel which I preach among the gentiles: though privately to those of note, least I should run, or had run in vain.
Acts 16:6
And when they had passed through Phrygia and Galatia, being forbidden by the holy Spirit to preach the word in Asia, they came to Mysia, and endeavoured to go to Bithynia:
1 Corinthians 15:58
Wherefore, my beloved brethren, be stedfast, unmoveable, 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, having espoused you to one husband, that I may present you as a chaste virgin to Christ.
2 Corinthians 12:20-21
For I am afraid least when I come, I should not find you such as I could wish, and I should be found to you such as ye would not: least there should be contentions, emulations, animosities, strifes, thwartings, whisperings, swellings, tumults: and least,
Galatians 4:20
till Christ be formed in you, I should be glad to be present with you even now, and to change my voice; for I am in doubt about you.
Galatians 5:2-4
Behold, I Paul say unto you, that if ye be circumcised, Christ will profit you nothing.
Philippians 2:16
exhibiting the word of life; to my rejoicing in the day of Christ, that I have not run in vain, nor laboured in vain.
2 John 1:8
Look to yourselves, that ye lose not the things which ye have wrought, but that ye may receive a full reward.