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.
Luke 14:34-35
Salt is excellent indeed: but if salt becomes insipid, what will restore its flavour?
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.
Mark 9:49-50
Everyone has to be consecrated by the fire of the discipline.
Hebrews 6:4-6
For in the case of people who have been once enlightened, who tasted the heavenly Gift, who participated in the holy Spirit,
2 Peter 2:20-21
After escaping the pollutions of the world by the knowledge of our Lord and saviour Jesus Christ, if they get entangled and overpowered again, the last state is worse for them than the first.