Matthew 5:13

You are the salt of the earth: but if the salt has lost its savor, how shall it be salted? it is thereafter good for nothing, but to be cast out, and to be trodden under foot of men.

Leviticus 2:13

And every offering of your grain offering shall you season with salt; neither shall you allow the salt of the covenant of your God to be lacking from your grain offering: with all your offerings you shall offer salt.

Luke 14:34-35

Salt is good: but if the salt has lost its taste, how shall it be restored?

Colossians 4:6

Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every man.

Mark 9:49-50

For every one shall be salted with fire, and every sacrifice shall be salted with salt.

Hebrews 6:4-6

For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Spirit,

2 Peter 2:20-21

For if after they have escaped the defilements of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

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
And every offering of your grain offering shall you season with salt; neither shall you allow the salt of the covenant of your God to be lacking from your grain offering: with all your offerings you shall offer salt.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every man.

If

Mark 9:49
For every one shall be salted with fire, and every sacrifice shall be salted with salt.
Luke 14:34
Salt is good: but if the salt has lost its taste, how shall it be restored?
Hebrews 6:4
For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Spirit,
2 Peter 2:20
For if after they have escaped the defilements of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

General references

Ezekiel 15:3
Shall wood be taken of it to do any work? or will men take a pin of it to hang any vessel on?