Matthew 5:13

“You are the salt of the earth; but if the salt has lost its taste (purpose), how can it be made salty? It is no longer good for anything, but to be thrown out and walked on by people [when the walkways are wet and slippery].

Leviticus 2:13

You shall season every grain offering with salt so that the salt (preservation) of the covenant of your God will not be missing from your grain offering. You shall offer salt with all your offerings.

Luke 14:34-35

“Therefore, salt is good; but if salt has become tasteless, with what will it be seasoned?

Colossians 4:6

Let your speech at all times be gracious and pleasant, seasoned with salt, so that you will know how to answer each one [who questions you].

Hebrews 6:4-6

For [it is impossible to restore to repentance] those who have once been enlightened [spiritually] and who have tasted and consciously experienced the heavenly gift and have shared in the Holy Spirit,

2 Peter 2:20-21

For if, after they have escaped the pollutions of the world by [personal] knowledge of our Lord and Savior Jesus Christ, they are again entangled in them and are overcome, their last condition has become worse for them than the first.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

The salt

Leviticus 2:13
You shall season every grain offering with salt so that the salt (preservation) of the covenant of your God will not be missing from your grain offering. You shall offer salt with all your offerings.
Colossians 4:6
Let your speech at all times be gracious and pleasant, seasoned with salt, so that you will know how to answer each one [who questions you].

If

Mark 9:49
“For everyone will be salted with fire.
Luke 14:34
“Therefore, salt is good; but if salt has become tasteless, with what will it be seasoned?
Hebrews 6:4
For [it is impossible to restore to repentance] those who have once been enlightened [spiritually] and who have tasted and consciously experienced the heavenly gift and have shared in the Holy Spirit,
2 Peter 2:20
For if, after they have escaped the pollutions of the world by [personal] knowledge of our Lord and Savior Jesus Christ, they are again entangled in them and are overcome, their last condition has become worse for them than the first.

General references

Ezekiel 15:3
Can wood be taken from it to make any object? Or can men take a peg from it on which to hang any vessel?