To speak lies and slander of another is contrary to the conduct fitting a child of God. The slanderer seeks to inhibit the prosperity, disturb the peace, and sully the name of his neighbor. There are many results that come upon the person who is slandered. Let me just close with two. First, it causes his reputation to suffer.
Many people make their living on the value of their reputation.
To destroy a good name may rob the person of the ability to provide for his family. Lastly, it makes the person slandered less capable of doing good in the world. This is why slandering a Christian is such a sad sin. It makes that person less capable of serving their Lord and being useful in the Kingdom of God.