Luke 14:34-35

Salt is good: but if the salt become insipid, by what shall it be seasoned?

Romans 3:12

All are turned aside together, they are become worthless; there is none that doeth good, there is not even one.

Treasury of Scripture Knowledge

Summary

Then I went to Euphrates, and digged, and took the girdle from the place where I had hid it: and, behold, the girdle was marred, it was profitable for nothing.

Bible References

It was

Luke 14:34
Salt is good: but if the salt become insipid, by what shall it be seasoned?
Romans 3:12
All are turned aside together, they are become worthless; there is none that doeth good, there is not even one.
Philemon 1:11
who in time past hath been an unprofitable servant to thee, but now very profitable to thee and to me: