Matthew 5:13
"You are the salt of the earth; but if the salt lose its savor, in what way shall it be salted? It is henceforth good for nothing but to be thrown out and trodden under foot of men.
Luke 14:34-35
"Salt is good, but if even the salt have lost its flavor, with what shall it be seasoned?
Colossians 4:6
Let your speech be always gracious, with a savor of salt, and learn how to give every man a fitting answer.
Mark 9:49-50
For by fire every one will be salted;
Hebrews 6:4-6
For in the case of those who have been once for all enlightened and have tasted of the heavenly gift,
2 Peter 2:20-21
For if, after having escaped the pollutions of the world, through the knowledge of our Lord and Saviour Jesus Christ, men are again entangled in them and overpowered, their last state is become worse than their first.