Colossians 4:6

Always let your conversation be seasoned with salt, that is, with winsomeness, so that you may know how to make a fitting answer to everyone.

Matthew 5:13

"You are the salt of the earth. But if salt loses its strength, what can make it salt again? It is good for nothing but to be thrown away and trodden under foot.

Mark 9:49-50

Everyone must be seasoned with fire. Salt is a good thing, but if salt loses its strength, how can you season it again?

Treasury of Scripture Knowledge

Summary

And every oblation of thy meat offering shalt thou season with salt; neither shalt thou suffer the salt of the covenant of thy God to be lacking from thy meat offering: with all thine offerings thou shalt offer salt.

Bible References

With salt

Matthew 5:13
"You are the salt of the earth. But if salt loses its strength, what can make it salt again? It is good for nothing but to be thrown away and trodden under foot.
Mark 9:49
Everyone must be seasoned with fire. Salt is a good thing, but if salt loses its strength, how can you season it again?
Colossians 4:6
Always let your conversation be seasoned with salt, that is, with winsomeness, so that you may know how to make a fitting answer to everyone.