What is the prayer that the Prophet Muhammad (saw) intended to reserve for the intercession of his Ummah on the Day of Resurrection?
 Abu Huraira reported:                      The Messenger of Allah (may peace be upon him) said: There is for every apostle a prayer, and I intend (if Allah so willed) that I would reserve my prayer for the intercession of my Ummah on the Day of Resurrection.