Luke 14:34

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

Matthew 5:13

Ye are the salt of the earth: but if the salt become insipid, with what can it be salted? it is of no farther use for any purpose, but to be cast out, and trodden under foot of men.

Mark 9:49-50

For every one shall be salted with fire, and every victim shall be sprinkled with salt.

Colossians 4:6

Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.

Hebrews 2:4-8

God superadding his testimony with them, by signs, and wonders, and various miracles, and gifts of the Holy Ghost, according to his own will?

Treasury of Scripture Knowledge

Summary

Salt is good: but if the salt have lost his savour, wherewith shall it be seasoned?

Bible References

But

Matthew 5:13
Ye are the salt of the earth: but if the salt become insipid, with what can it be salted? it is of no farther use for any purpose, but to be cast out, and trodden under foot of men.
Mark 9:49
For every one shall be salted with fire, and every victim shall be sprinkled with salt.
Colossians 4:6
Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.
Hebrews 2:4
God superadding his testimony with them, by signs, and wonders, and various miracles, and gifts of the Holy Ghost, according to his own will?