"You are the salt of the earth. But if the salt loses its saltiness, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled underfoot." (NIV)

You are the salt of the earth, but if salt has lost its taste (its strength, its quality), how can its saltness be restored? It is not good for anything any longer but to be thrown out and trodden underfoot by men. (AMP)

Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men. (KJV)