Matthew 5:13 Ye are the salt of the land, but if the salt may lose savour, in what shall it be salted? for nothing is it good henceforth, except to be cast without, and to be trodden down by men. (See NIV)
Mark 9:50 Salt is good, but if the salt has lost its saltiness, with what will you season it? Have salt in yourselves, and be at peace with one another." (WEB NIV)
Luke 14:34 The salt 'is' good, but if the salt doth become tasteless, with what shall it be seasoned? (See NIV)