I have heard about spiritual guides called Murshids and Khalifas. Could anyone give me some more information regarding this. From what I have read I would think of this as an innovation to the deen and labelled as Bid'ah. In extreme ways I understood that the Khalifa sits on the seat of sajjada? Could anyone explain me what this is. Also the person that sits on this seat should have several qualities among 2 of Allah, of the Prophet pbuh and some companions and family of the Prophet. Besides needs to also be a descendant of the Prophet pbuh.