Human nature greedily swallows gossip. God warns here that gossip is never superficial but that we thoroughly assimilate it to become part of us. Lies about others die hard because, in our vanity, we are so eager to elevate ourselves while mentally putting down another.
Here is a good maxim to live by: Never believe anything bad about a person unless you know it to be absolutely true; never tell it unless it is absolutely necessary; and remember, fear God, for He is listening while you tell it.
John W. Ritenbaugh
The Ninth Commandment (1997)
A juicy tale seems so sweet on the tongue, yet as it works its way deeper, it becomes bitter and harmful. We often have the mistaken notion that if we emphasize something bad about another, it will make us look better. Scripturally, the opposite is true. I Corinthians 12:26 teaches us that if one member suffers, all the parts share the suffering. Like a boomerang, our weapon against our brother will eventually return to smack us.
The trader in gossip suffers as much as the victim. Trading in gossip appears analogous to contracting a severe communicable disease, like pulmonary tuberculosis, which, if not arrested, could cost us our eternal life. The effects upon the gossiper's character are initially unnoticeable, but the symptoms gradually worsen until the talebearer becomes engulfed in the paroxysms of bitterness and hatred.
David F. Maas
Purging the Rumor Bug from the Body of Christ