Every grain offering you make is to be seasoned with salt; and you must not allow the salt of the covenant of your God to be missing from your grain offering. Along with every offering of yours, you will present salt.
What does salt symbolize?
It has often been used as a preservative and an antiseptic.
Therefor it can symbolize permanence and cleanliness.
We also have a “preserving” effect when we positively influence others through uncorrupted moral behavior.
In effect, today we do not make food offerings, but rather, we “offer to God […] the fruit of our lips,” (Heb. 13:15).
How do we add “salt” to our praise?
In other words, we ought to think before we speak and say things in a considerate manner.