The Conquest of the Ummah

The Ummah was about to collapse and Allah saved it through Abu Bakr. He managed to do what no other Khalifa has ever done, he wiped off the Persians from the face of this earth as if they never existed. When I leave Ramrul Al Khattab, who will take charge? That when I leave Rabi'i al-Aqsa is a question that must be answered by all Muslims.