Luke 14:34

Salt is excellent indeed: but if salt becomes insipid, what will restore its flavour?

Matthew 5:13

You are the salt of the earth. But if salt becomes insipid, what can make it salt again? After that it is fit for nothing, fit only to be thrown outside and trodden by the feet of men.

Mark 9:49-50

Everyone has to be consecrated by the fire of the discipline.

Colossians 4:6

let your talk always have a saving salt of grace about it, and learn how to answer any question put to you.

Hebrews 2:4-8

while God corroborated their testimony with signs and wonders and a variety of miraculous powers, distributing the holy Spirit as it pleased him.

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
You are the salt of the earth. But if salt becomes insipid, what can make it salt again? After that it is fit for nothing, fit only to be thrown outside and trodden by the feet of men.
Mark 9:49
Everyone has to be consecrated by the fire of the discipline.
Colossians 4:6
let your talk always have a saving salt of grace about it, and learn how to answer any question put to you.
Hebrews 2:4
while God corroborated their testimony with signs and wonders and a variety of miraculous powers, distributing the holy Spirit as it pleased him.