Matthew 5:13
Ye are the salt of the earth. But if the salt have lost its savor, wherewith shall itself be salted? It is thenceforth good for nothing, but to be cast out, and to be trodden under foot by men.
Luke 14:34-35
Salt then is good; but if the salt itself have lost its savor, wherewith shall it be seasoned?
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every one.
Mark 9:49-50
For every one will be salted with fire.
Hebrews 6:4-6
For it is impossible that those who have once been enlightened, and have tasted of the heavenly gift, and been make partakers of the Holy Spirit,
2 Peter 2:20-21
For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein and overcome, the last state is worse with them than the first.