Matthew 5:13
You are the salt of the earth: but if the salt have lost his flavor, with which shall it be salted? it is thereafter good for nothing, but to be cast out, and to be trodden under foot of men.
Nave's Topical Index—AKJV

Mark 9:49,50
For every one shall be salted with fire, and every sacrifice shall be salted with salt.
Nave's Topical Index—AKJV

Luke 14:34
Salt is good: but if the salt have lost his flavor, with which shall it be seasoned?
Nave's Topical Index—AKJV