Because two daughters of prophet muhammad got married to hazrat usman ..zun noor..
because two daughters are got maried to zunoor
HAZRAT USMAN was the third khalipha.
Hazrat Ume Kulsoom & Hazrat Ruqaiyya.
Mysara
Affan
Urwa Binte kariez .
Hazrat Abu Bakr, Hazrat Umar Farooq, Hazrat Usman Ghani, Hazrat Ali (May Allah be pleased with them all).
Hazrat Usman (Ral)
The first Four Caliphs are Called the Rightful (Rashidoon) Caliphs. They were in order of seniority: Hazrat Abubakr, Hazrat Umar, Hazrat Usman and Hazrat Ali (May Allah be pleased with them). The fifth Caliph was Hazrat Hasan (RA) who surrenderd his right to Hazrat Amir Muawya (RA)
The third Righteous Caliph Hazrat Usman Ghani RAU. He is also known as jami-ul-Qur'an.
Hazrat Usman rad. Because he had married two of the noble daughters of the prophet SAW
The Muslims are bound to follow the example of beloved Prophet Hazrat Muhammad (SAW), as he is the best example.
they were 10 in numbers but i am missing the name some of them, Hazrat Abu Baker Siddique,Hazrat Umer,Hazrat Usman,Hazrat Ali,Hizrat Billal,Hazrat Salman Farsi, Etc...