Colossians 4:6

Let your word be always with grace, seasoned with salt, that you may know how it behooves you to answer each one.

Matthew 5:13

Ye are the salt of the earth; and if the salt may lose its savor, in what shall it be salted? It is yet without value, except having been cast out, to be trodden under feet by the people.

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; and if the salt may lose its savor, in what shall it be salted? It is yet without value, except having been cast out, to be trodden under feet by the people.
Mark 9:49
For every one shall be salted with fire.
Colossians 4:6
Let your word be always with grace, seasoned with salt, that you may know how it behooves you to answer each one.