Nikah is an Arabic term used for marriage. It means   “contract.” The Quran specifically refers to marriage as “mithaqun   Ghalithun,” which means “a strong covenant.”  Allah says: 
        
          “…and they have taken a strong pledge (Mithaqun Ghalithun) from you.”  (Quran, 4:21) 
        
        The seriousness of this covenant becomes obvious when   one finds the same term (Mithaqun Ghalithun) being used for the   covenant made between Allah and the Prophet (صلّى الله عليه وآله وسلّم)   before granting him the responsibility of the Prophethood. (Quran, 33:7)
        The Quran also uses the Arabic word “Hisn” in reference to marriage, which likens marriage to being a fortress of righteousness.
        As such, the importance of marriage cannot be   understated.  A man does not easily give his daughter in marriage away   unless he is assured of the goodness of the husband-to-be.
        Allah Almighty commands the Muslims  in the Quran to only marry righteous people:
        
          “And marry such of you as are single and the pious.”  (Quran, 24:32)
        
        Conversely, it is Haram (forbidden) for a Muslim to marry an unrighteous person. The Prophet (صلّى الله عليه وآله وسلّم) has said:
        
          “You should marry the religious woman, otherwise you will be a loser.”
        
        Furthermore, it is Haram for a father to give his daughter to a sinful man.  This is confirmed by all of the Shia Maraje’ (top scholars), and so there should be no question on this.
        The Shia declare that the first Three Caliphs were   sinful and evil people.  The Shia declare them to be Nasibis and enemies   of the Prophet (صلّى الله عليه وآله وسلّم) and of the Ahlel Bayt.
        But how can the Shia reconcile the fact that the Prophet (صلّى الله عليه وآله وسلّم) gave two of his daughters in marriage to the third Caliph, Uthman bin Affan   (رضّى الله عنه)?   Why would the Prophet (صلّى الله عليه وآله وسلّم)   give two of his daughters to a sinful and evil man?  By questioning   Uthman’s character (رضّى الله عنه), the Shia are declaring the Prophet   (صلّى الله عليه وآله وسلّم) to be sinful by violating the Quran and his   own sayings which clearly declare that it is Haram to give a daughter to   a sinful man!
        The Prophet (صلّى الله عليه وآله وسلّم) first gave   his daughter Ruqayyah (رضّى الله عنها) to Uthman (رضّى الله عنه), and   then later, he also gave him his other daughter, Umm Kulthoom (رضّى الله   عنها).  What noble character Uthman (رضّى الله عنه) must have had based   on the fact that the Prophet (صلّى الله عليه وآله وسلّم) trusted him   with his daughters–not just one but two!
        Abu Bakr (رضّى الله عنه), the first Caliph, was so   close to the Prophet (صلّى الله عليه وآله وسلّم) that he gifted his   daughter in marriage to the Prophet (صلّى الله عليه وآله وسلّم).  Her   name was Aisha (رضّى الله عنها), and yet we find that the Shia revile   her too.  They refer to her as a sinful transgressor, and an enemy of   Ahlel Bayt.  Would the Prophet (صلّى الله عليه وآله وسلّم) really marry   someone who was sinful and impious?  This is accusing the Prophet (صلّى   الله عليه وآله وسلّم) of sinning and violating the Quran as well as his   own sayings.  By marrying Abu Bakr’s daughter, the Prophet (صلّى الله   عليه وآله وسلّم) showed his undying solidarity with Abu Bakr (رضّى الله   عنه), who–other than being the Prophet’s father-in-law–was the Prophet’s   best frend and top liuetenant. 
        The Prophet (صلّى الله عليه وآله وسلّم) also married   Hafsa (رضّى الله عنها), the daughter of Umar bin Khattab (رضّى الله عنه)   who was the second Caliph.  How could Prophet Muhammad (صلّى الله عليه   وآله وسلّم) make such catastrophic mistakes and marry the daughters of   his supposed enemies?  The Shia revile Umar (رضّى الله عنه) and accuse   him of being an enemy of Islam.  But this is simply preposterous based   on the fact that the Prophet (صلّى الله عليه وآله وسلّم) married his   daughter Hafsa (رضّى الله عنها)!
        And to deliver the knock-out punch, Ali (رضّى الله   عنه) gave his own daughter in marriage to Umar (رضّى الله عنه).  Her   name was Umm Kulthoom (a different Umm Kulthoom than the Prophet’s   daughter).  It shatters the entire foundation of Shi’ism when we   consider that Ali (رضّى الله عنه) gave his daughter Umm Kulthoom (رضّى   الله عنها) in marriage to Umar (رضّى الله عنه).  The entire Shia   paradigm of the Three Caliphs being enemies of Ali (رضّى الله عنه) thus   collapses. 
        As can be seen, all of the Three Caliphs (which Shia   insult and call the “three fools”) were linked to Prophet Muhammad (صلّى   الله عليه وآله وسلّم) through marriage, blood, or both. That is how   close friends the Three Caliphs and the Prophet (صلّى الله عليه وآله   وسلّم) were. Furthermore, Ali (رضّى الله عنه) gave his daughter in   marriage to Umar (رضّى الله عنه), and this just shows how mischievious   the Shia propagandists are when they try to make it look like they were   all enemies. Far from it! None of them were enemies. They were all best   of friends and Sahabah (Companions) to each other. Indeed, Ali (رضّى   الله عنه) was the vizier and top aid to all Three Caliphs.
        Whoever insults the first Three Caliphs is thereby   insulting the relatives of the Prophet (صلّى الله عليه وآله وسلّم) and   Ali (رضّى الله عنه).  Is this a position the Shia would really like to   be in?  The truth is that the Shia propagandists are the ones who are   Nasibis and they are the ones who hate the close ones of the Ahlel Bayt.
        Article Written By: Ibn al-Hashimi, www.ahlelbayt.com