What is the prayer that Prophet Muhammad (saw) reserved for the intercession of his Ummah on the Day of Resurrection?
 Amr b. Abu Sufyan reported:                      Abu Huraira said to Ka'b al-Ahbar that the Apostle of Allah (may peace be upon him) had said: For every apostle there Is a (special) prayer by which he would pray (to his Lord). I, however, intend (if Allah so willed) that I would reserve my prayer for the intercession of my Ummah on the Day of Resurrection. Ka'b said to Abu Huraira: Did you hear this from the Messenger of Allah (may peace be upon him)? Abu Huraira said: Yes.