Colossians 4:6

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

Matthew 5:13

You are the salt of the earth: but if the salt has become tasteless, by what means shall it become salt again? It is then good for nothing but to be thrown out and trod upon by men.

Mark 9:49-50

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

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 the salt has become tasteless, by what means shall it become salt again? It is then good for nothing but to be thrown out and trod upon by men.
Mark 9:49
For every one shall be salted with fire, and every sacrifice shall be seasoned with salt.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every one.