Hadith.5258 - The Prophet Muhammad (peace be upon him and his family) said:
"Whoever harms one under my protection (dhimmah) has indeed harmed me."
If causing harm to them equates to harming the Prophet صلى الله عليه وعلى آله وسلم himself, then how severe must it be when it comes to killing them?
The Prophet (peace be upon him and his family) intended through this statement to emphasize the sanctity of his daughter, Sayyidah Fatimah {s.a} (peace be upon her).
Prophet صلى الله عليه وعلى آله وسلم stated: "Whoever harms one under my protection has harmed me," to prevent any form of oppression or harm towards them. How much greater then is the harm caused to my daughter (Fatimah {s.a}), my own flesh and blood, who is the leader of the women of all times?
Prophet صلى الله عليه وعلى آله وسلم reinforced this meaning by saying: "Whoever harms her (Sayyidah Fatima {s.a}) has harmed me, whoever angers her (Sayyidah Fatima {s.a}) has angered me, and whoever pleases her (Sayyidah Fatima {s.a}) has pleased me."