It’s defined as spreading rumors or lies about a person to cause damage purposely. The written form of it is libel.
The Bible mentions slander countless times in lists like this one: “But now you must rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips” (Colossians 3:8).
James 4:11 tells it straight: “Brothers, do not slander one another.”
Persecution Live 