The Namaz of Hazrat Ali (as)

In the battle of Siffīn an arrow head pierced the thigh of ‘Ali (a.s.). It was not possible to pull it out because of the unbearable pain it caused. When Imam Hasan (a.s.) was consulted in the matter, he told the people to just wait till ‘Ali (a.s.) stands for prayer and to remove the arrow while ‘Ali (a.s.) was praying. Accordingly the arrow was pulled out while ‘Ali (a.s.) praying and ‘Ali (a.s.) was totally oblivious of the excruciating pain. When ‘Ali (a.s.) stood for prayers, the world ceased to exist for him. His entire being was totally immersed in the contact he had established with his Creator and his relationship with Him.  Reference : Greater Sins Volume 3