Slander
Slander is to utter or spread a false statement which is harmful to another’s character or reputation. The Quran strictly forbids slander because it spreads misunderstanding and hatred and breaks relations between people.
The Holy Prophet(sal,lal,la,ho,ala,he,wasalam) is reported to have said:
“Allah will not forgive the slanderer until the one he has slandered has forgiven him.” (Mishkat)
And again: “The worst slaves of Allah are those who slander, separate friends and distress others.” (Ahmad)
He also said: “Slander is to say something about your brother that he would dislike.
It what you say about him is false, you have slandered him and if it is true you have called him bad names.” (Muslim)
How to Talk
There are many people who keep on talking, never giving others a chance to speak. This is a very bad habit. A Muslim speaks only when necessary; otherwise, he keeps quiet. The Holy Prophet(sal,lal,la,ho,ala,he,wasalam) said:
“He who believes in Allah and the Last Day should speak good or keep silent.”
The Holy Prophet(sal,lal,la,ho,ala,he,wasalam) never talked too much. Whatever he said was brief but enough to make his meaning clear to people. It is also bad manners to interrupt people when they are talking unless it is very necessary to do so. It is better to wait till they finish what they want to say.