13 You are the salt of the earth. Now if the salt become insipid, with what can it be made salt? It is no longer fit for any thing, but to be thrown out of doors, and trampled under foot by men.
Matthew 5:13 Cross References - Thomson
Leviticus 2:13
13 Every gift of your sacrifice must be seasoned with salt. You shall not withhold the salt of the covenant of the Lord from your sacrifices. With every gift you make, you shall offer salt to the Lord your God.
Mark 9:49-50
Luke 14:34-35
Colossians 4:6
6 Let your conversation be always with courteousness, seasoned with salt, with a knowledge how you ought to answer every one.
Hebrews 6:4-6
4 for with regard to them who have been once enlightened, and have tasted this free, this heavenly gift, and have been made partakers of a holy spirit,
5 and tasted the good word of God, and the miraculous powers of the age about to come,
6 and have fallen off; it is impossible to renew them again for a reformation, since they are crucifying for themselves afresh the son of God and exposing him to open shame.
2 Peter 2:20-21
20 For if alter fleeing from the pollutions of the world by an acknowledgment of the Lord and Saviour Jesus Christ, any are again entangled and overcome by them, the last state of such persons is worse than the first.
21 For it had been better for them not to have known the way of righteousness, than, after knowing it, to turn away from the holy commandment delivered to them.