“When we study the legacy of Muhammad (may Allah’s peace be upon him) in morals and when we review his sayings which run into the thousands on virtue, we have the impression that if an army of psychologists and educationists were to come together and try to produce such advice, they would fail.  Yet morality is only one branch of the Prophet’s (may Allah’s peace be upon him) message.”

This excerpt is from the book:
‘Fiqh-us-Seerah – Understanding the Life of Prophet Muhammad,’
by Muhammad Al-Ghazali; 
Second Edition, page #48; 
International Islamic Publishing House, Saudi Arabia.  

The people used to come from their abodes and from Al-’Awali (i.e. outskirts of Madina up to a distance of four miles or more from Medina).  They used to pass through dust and used to be drenched with sweat and covered with dust; so sweat used to trickle from them. One of them came to Allah’s Apostle (may Allah be pleased with him) who was in my house.  The Prophet said to him:

“I wish that you keep yourself clean on this day of yours (i.e. take a bath).”

[Sahih Bukhari; Book 13, #25]

 The companions of Allah’s Apostle (may Allah’s peace be upon him) used to practise manual labor, so their sweat used to smell, and they were advised to take a bath.

[Sahih Bukhari; Book 34, #285]

The Messenger of Allah (may Allah’s peace be upon him) said:

“The example of a scholar who teaches people goodness and forgets himself is like a lamp which illuminates for the people but burns itself.”

[Reported by At-Tabarany in Al Mu`jam Al Kabir 2/178, No. (1681) and Al Albany graded it as good.]

Taken from:
http://www.alssunnahnet.com/en/articles.aspx?article_no=2606

The Prophet (may Allah’s peace be upon him) said:

“One of the sayings of the prophets which the people have got, is:  ’If you do not feel ashamed, then do whatever you like.’”

[Sahih Al Bukhari; Bokk 56, # 690]

PS:  Please see this article for explanation of this hadith:
http://www.alssunnahnet.com/en/articles.aspx?article_no=1726

O you who have believed, why do you say what you do not do?

Great is hatred in the sight of Allah that you say what you do not do.

[Quran, Surat As-Saf (61):2-3]

The Prophet Muhammad (may Allah’s peace be upon him) said:

“Indeed, I was sent to complete good morals.”

[Ahmad 2/381; Al Bukhari in Aladab Almufrad #273]

A man asked the Prophet Muhammad (May Allah be pleased with him) to counsel him and he said:

Do not become angry.

The man repeated that several times and he replied:

Do not become angry.

[Al-Bukhari; as quoted in Riyad-us-Saliheen; Chapter 3, #48; Dar-us-Salaam Publications]

Allah’s Messenger (may Allah’s peace be upon him) said:

The strong man is not one who is good at wrestling, but the strong man is one who controls himself in a fit of rage.

[Al-Bukhari and Muslim; as quoted in Riyad-us-Saliheen; Chapter 3, #45; Dar-us-Salaam Publications]

“I did not see anyone who smiled more than Rasulullah (Messenger of Allah, Muhammad; may Allah’s peace be upon him)”

[Shamaa-il Tirmidhi; Source QuranWeekly.com]