Matthew 5:13 "*You* are the salt of the earth; but if salt has become tasteless, in what way can it regain its saltness? It is no longer good for anything but to be thrown away and trodden on by the passers by. (WEY RSV)
Mark 9:50 Salt is good: but if the salt have lost his saltness, wherewith will ye season it? Have salt in yourselves, and have peace one with another. (KJV WEY ASV WBS RSV)
Luke 14:34 The salt 'is' good, but if the salt doth become tasteless, with what shall it be seasoned? (See RSV)