What did Abu Bakr do when he saw the Prophet Muhammad (saw) suddenly appear while he was leading the prayer?
      Narrated Anas bin Malik:                          While Abu Bakr was leading the people in the morning prayer on a      Monday, the Prophet came towards them suddenly having lifted the      curtain of 'Aisha's house, and looked at them as they were standing in     rows and smiled. Abu Bakr tried to come back thinking that Allah's      Apostle wanted to come out for the prayer. The attention of the      Muslims was diverted from the prayer because they were delighted to      see the Prophet. The Prophet waved his hand to them to complete their      prayer, then he went back into the room and let down the curtain. The      Prophet expired on that very day.