When Abu Bakr became Caliph...

When Abu Bakr became Caliph, he gave order to Usamah bin Zaid to move the army, and asked him to leave Umar in Medina as the Abu Bakr administration Tradition of Ibn Abil Hadid that which is in Sharh Nahjul Balagha advisor. Usamah said: What do you say about yourself? Abu Bakr replied: "O son of my brother! you see what people have done. They have selected me to rule over them; leave Umar for my help and you proceed on…