Colossians 4:6

Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer each one.

Matthew 5:13

"Ye are the salt of the earth; but, if the salt become tasteless, with what shall it be salted? It is henceforth good for nothing, except, when cast without, to be trodden under foot by men.

Mark 9:49-50

For every one shall be salted with fire.

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
"Ye are the salt of the earth; but, if the salt become tasteless, with what shall it be salted? It is henceforth good for nothing, except, when cast without, to be trodden under foot by men.
Mark 9:49
For every one shall be salted with fire.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer each one.