Matthew 5:13
You are the salt of the earth: but if the salt has become tasteless, by what means shall it become salt again? It is then good for nothing but to be thrown out and trod upon by men.
Luke 14:34-35
Salt is good; but if the salt become taste less, by what means shall it become salt again?
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every one.
Mark 9:49-50
For every one shall be salted with fire, and every sacrifice shall be seasoned with salt.
Hebrews 6:4-6
For it is impossible to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made 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 Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.