Matthew 5:13
"Ye are the salt of the earth; but, if the salt become tasteless, with what shall it be salted? It is henceforth good for nothing, except, when cast without, to be trodden under foot by men.
Luke 14:34-35
Salt, therefore, is good; but if even the salt become tasteless, with what 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 each one.
Mark 9:49-50
For every one shall be salted with fire.
Hebrews 6:4-6
For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,
2 Peter 2:20-21
For if, after having escaped the defilements of the world in a full knowledge of our Lord and Savior Jesus Christ, but, having again become entangled with these, they are overcome, the last state has become worse with them than the first.