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.
Luke 14:34-35
Salt is good: but if the salt become insipid, by what shall it be seasoned?
Colossians 4:6
Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.
Mark 9:49-50
For every one shall be salted with fire, and every victim shall be sprinkled with salt.
Hebrews 6:4-6
For it is not possible to renew again unto repentance those who have been once illuminated, and have tasted the celestial gift, and have been made partakers of the Holy Ghost,
2 Peter 2:20-21
For if having escaped from the defilements of the world by the knowledge of our Lord and Saviour Jesus Christ, they are again enveloped by them and overcome, their last deeds are worse than the first.