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Shiavault - a Vault of Shia Islamic Books Hayat Al-Qulub Vol.3 Part 9: Different traditions that mention the nomination of all the Imams together Abu Hurairah has narrated in the book Basharatul Mustafa that the Holy Prophet (S) said the best among you is the one who is the best in favor of my Ahlul Bayt (a.s.).
Likewise Jabir bin Abdullah Ansari has narrated that the Holy Prophet (S) said that people are known according to their paternal relation except the progeny of my daughter Fatima (s.a.) because I am their guardian (Wali) and their Usbah (close relative). They are my Progeny who are born of my essence ( Teenat ). Woe unto them who deny their gracefulness. Allah befriends those who befriend them (my Progeny) and Allah is the enemy of those who are their enemy.
Similarly, according to reliable chains of narrators, Ali (a.s.) is reported to have said that certainly, Allah has made five things obligatory for His slaves which are the best of all deeds. They are Prayer, Fasting, Zakat, Hajj and the Wilayat of we Ahlul Bayt (a.s.). People acted upon the first four things but they insulted and disregarded the fifth one.
By Allah, acting upon the said four things cannot be considered complete unless the fifth one is also acted upon, that is until they do not have the belief in the Imamate of we Ahlul Bayt (a.s.) which a condition for the acceptance of all the four.
Similarly, it is also related by Ali (a.s.) that: We are Najeeb (excellent) and Shareef (Noble) and our progeny is the prophet’s and our group is group of Allah and the group which rises against us is the group of the devil and the one who considers us like others is not from us.
The author of the book Misbahul Anwar has narrated from Imam Sadiq (a.s.) that the Holy Prophet (S) said: I am the balance of knowledge and Ali (a.s.) is like its two scales and Hasan and Husain (a.s.) are its two strings and Fatima (s.a.) is its beam. The Imams following them will measure (weigh) their friends and foes with this balance. Those who are their enemies are condemned by Allah and by those who condemn.
Ibne Athir has, in Jamiul Usool, quoted from Tirmidhi the words of Ali (a.s.): The Holy Prophet (S) held the hands of Imams Hasan and Husain (a.s.) and said: The one who befriends me and these two children and their parents will be with me and in my company on the Day of Qiyamat.