Imamah (Arabic: إمامة‎) is the Shia Islam doctrine (belief) of religious, spiritual and political leadership of the Ummah. The Shia believe that the Imams are the true Caliphs or rightful successors of Muhammad, and further that Imams are possessed of divine knowledge and authority (Ismah) as well as being part of the Ahl al-Bayt, the family of Muhammad. These Imams have the role of providing commentary and interpretation of the Quran as well as guidance to their tariqa followers as is the case of the living Imams of the Nizari Ismaili tariqah. 

Shias believe that Imamah is of the Principles of Faith (Usul al-Din).As the verse 4:165 of quran expresses the necessity to the appointment of the prophets; so after the demise of the prophet who will play the role of the prophet; till the people have not any plea against Allah.So the same logic that necessitated the assignment of prophets also is applied for Imamah.That is Allah Must assign someone similar to prophet in his attributes and Ismah as his successor to guide the people without any deviation in religion. They refer to the verse (...This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion...) 5:3 of Quran which was revealed to the prophet when he appointed Ali as his successor at the day of Ghadir Khumm.
Is imanah a religious document?
Which religion is this?
Who Shia believe as the successor of their prophet?
What they believe as the Principles of Faith?
What is it called in Arabic?
Which verse implies that?
Of which scripture?
Does it support their views?
is there any other verse that implies that?
Which one?
Whom it was revealed upon?
in what occasion?
When?
Do Imams have duties to offer?
What duties?
Any other duties?
Do we have any current day example?
Like what?
Do Shia believe divinity in Imams?
Do they exercise any other rights?
Why?
yes
 religious
Shia Islam
Shia Islam
Imams
Imams
Imamah
Imamah
Usul al-Din
Usul al-Din
4:165
4:165
quran
quran
yes to them
 logic that necessitated the assignment of prophets also is applied for Imamah
yes
5:3 of Quran
5:3 of Quran
5:3 of Quran
to the prophet
to the prophet 
when he appointed Ali as his successor
when he appointed Ali as his successor
at the day of Ghadir Khumm
at the day of Ghadir Khumm
yes
Imams have the role
interpreting the Quran
providing commentary and interpretation of the Quran
yes, guidance.
guidance
yes
case of the living Imams
Nizari Ismaili tariqah
Imams of the Nizari Ismaili tariqah
Yes.
divine knowledge
yes, authority
authority (Ismah)
Because they are family of Muhammad
 family of Muhammad