Colossians 4:6

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

Matthew 5:13

Ye are the salt of the earth: but if the salt have lost its 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.

Mark 9:49-50

For every one shall be salted with fire, and every sacrifice shall be salted 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
Ye are the salt of the earth: but if the salt have lost its 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.
Mark 9:49
For every one shall be salted with fire, and every sacrifice shall be salted with salt.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every one.