Hadis

Abdullah bin Masud narrated that the messenger of Allah said : "The blood of a Muslim may not be legally spilt other than in one of three [instances] : the married person who commits adultery; a life for a life; and one who forsakes his religion and abandon the community. "
Related by Bukhari and Muslim

Abu Hurairah narrated that the messenger of Allah said : "Let him who believes in Allah and the Last Day either speak good or keep silent, and let him who believes in Allah and the Last Day be generous to his neighbour, and let him who believes in Allah and the Last Day be generous to his guest."
Related by Bukhari and Muslim

On the authority of Abu Hurairah, who said : a man said to the prophet : "Counsel me". He said : " Do not become angry". The man repeated [his request] several times, and he said: "Do not become angry".
Narrated by Bukhari