Hadith is the sayings and actions of Prophet Muhammad (peace be upon him), it is considered along with the Quran the major sources of Islamic Laws.
The following are few sayings of Prophet Muhammad (peace be upon him) which are concerned with moral characters and values, there are many more narrations on various topics if you want to search the full collection of Hadith. The Quotation in the end of each Hadith is for references of the Hadith collection source.
Truthfulness
“It is incumbent upon you to be always truthful, for truthfulness guides to absolute piety & piety leads to Paradise. A man who always tells the truth & pursues the truth is written with Allah as a truthful one. Refrain from lying, for lying guides to sinfulness & sinfulness leads to Hellfire. A man continues to tell lies & pursues lies until he is written with Allah as a liar.” [Bukhari]
‘‘Give up what is doubtful to you for that which is not doubtful; for truth is peace of mind and falsehood is doubt.” [Tirmidhi]
“Say what is true, although it may be bitter and displeasing to people.’’ [Baihaqi]
‘‘Strive always to excel in virtue and truth.’’ [Bukhari]
Mercy
‘‘Allah will not give mercy to anyone, except those who give mercy to other creatures.’’ [Tirmidhi]
Generosity
‘‘The one who helps widows & poor people is like a warrior fighting for Allah’s Cause or like a person who fasts during the day & prays all the night.’’ [Bukhari]
Conscience
“When something weighs on your conscience, give it up.” [Tirmidhi]