Luke 17:10

So also you, when you shall have done all things that you arc commanded to do, say, We are unprofitable servants; for we have done what was our duty to do.

Matthew 25:30

And cast the unprofitable servant into the darkness without. There shall be weeping and gnashing of teeth.

Romans 11:35

Or, who has first given to him, and received from him a recompense?

Matthew 25:37-40

Then will the righteous answer him, saying: Lord, when did we see thee hungry, and feed thee? or thirsty, and give thee drink?

Romans 3:12

they have all turned out of the way; they have alike become unprofitable; there is none that does good, not even one;

1 Corinthians 9:16-17

For though I preach the gospel, I have no cause for boasting; for a necessity is laid upon me; yes, alas for me, if I preach not the gospel.

1 Corinthians 15:9-10

For I am the least of the apostles, and I am not worthy to be called an apostle, because I persecuted the church of God.

Philippians 3:8-9

Yes, verily, I also count all things to be loss, for the excellence of the knowledge of Christ Jesus my Lord, on account of whom I have suffered the loss of all things, and do count them to be refuse, that I may gain Christ,

1 Peter 5:5-6

Likewise, you younger, be in subjection to the older: do you all indeed be subject one to another, and be clothed with humility: for God resists the proud, but gives grace to the lowly.

Treasury of Scripture Knowledge

Summary

So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.

Bible References

General references

Matthew 25:30
And cast the unprofitable servant into the darkness without. There shall be weeping and gnashing of teeth.
Romans 3:12
they have all turned out of the way; they have alike become unprofitable; there is none that does good, not even one;
Romans 11:35
Or, who has first given to him, and received from him a recompense?
1 Corinthians 9:16
For though I preach the gospel, I have no cause for boasting; for a necessity is laid upon me; yes, alas for me, if I preach not the gospel.
1 Corinthians 15:9
For I am the least of the apostles, and I am not worthy to be called an apostle, because I persecuted the church of God.
Philippians 3:8
Yes, verily, I also count all things to be loss, for the excellence of the knowledge of Christ Jesus my Lord, on account of whom I have suffered the loss of all things, and do count them to be refuse, that I may gain Christ,
Philemon 1:11
who, for some time, has been unprofitable to you, but now is very profitable to you and to me:
1 Peter 5:5
Likewise, you younger, be in subjection to the older: do you all indeed be subject one to another, and be clothed with humility: for God resists the proud, but gives grace to the lowly.