Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
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1 Corinthians 15:56-58
Tyndale Open Study Notes (CC BY-SA 4.0).
15:58 Nothing you do for the Lord is ever useless: There will be eternal rewards for those who serve him faithfully (see 3:12-15).
Other Bible passages linked to this one, most cited first.
And let us not be weary in well doing: for in due season we shall reap, if we faint not.
Be ye strong therefore, and let not your hands be weak: for your work shall be rewarded.
For God is not unrighteous to forget your work and labour of love, which ye have shewed toward his name, in that ye have ministered to the saints, and do minister.
Holding forth the word of life; that I may rejoice in the day of Christ, that I have not run in vain, neither laboured in vain.
Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.
Ye therefore, beloved, seeing ye know these things before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness. But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.