The first sin ever committed was hasad (spiteful envy).

Breaking promises is one of the main characteristics of the hypocrites.

Mahmood ibn Labeed was one of the longest living companions.

Oppression (thulm) is layers of darkness on the Day of Judgment.

The Prophet (may Allah raise his rank and grant him peace) supplicated against some people for Allah to put hardship on them. They are: those who put hardships upon those under their authority in this life.  

According to the wording of a hadeeth we studied, a "shadeed" (strong man) is one who does not become angry.

People who misuse the wealth which Allah gave them face a severe threat of Fire on the Day of Judgment.

The Prophet (may Allah raise his rank and grant him peace) once told a man who was seeking advice (what means): "Do not get angry." He repeated this each time he asked for advice.

Paradise is forbidden for the one who dies while deceiving those under his authority.

It is never allowed to be suspicious of a Muslim.

The definition of backbiting is: Mentioning something false about your brother which he would hate to hear.

The hadeeth about not striking in the face does not apply to Muslims, because it is never legislated to strike a Muslim in the first place.

Section Four of our book, 130 Hadeeth on Manners, contains a total of less than 30 hadeeth narrations.

Slander is more severely sinful than backbiting.

According to the hadeeth of Mahmood ibn Labeed, the thing which the Prophet (may Allah raise his rank and grant him peace) feared most for his followers was: showing off.

According to the hadeeth of Jaabir, oppression is a sin that destroyed those who came before us.

Insulting a Muslim is kufr (disbelief or a serious level of ingratitude), and fighting him is fusooq (disobedience).

According to the wording of a hadeeth we studied, anger is a sin eats away one's good deeds like how fire devours wood.

Even though the Prophet (may Allah raise his rank and grant him peace) forbade us from getting angry, he got angry for the sake of Allah, and it is still virtuous for Muslims to get angry for the sake of Allah (not for personal reasons).

Suspicion is described as "the most untruthful kind of speech" in one of the hadeeths we studied.