The Qur’an has unequivocally stated that showing cowardice and running away from the battlefield once a person has stepped into it is not befitting for a believer. So great is this sin, that the Almighty has promised the fateful doom of Hell fire on such an act of cowardliness:


يَاأَيُّهَا الَّذِينَ آمَنُوا إِذَا لَقِيتُمْ الَّذِينَ كَفَرُوا زَحْفًا فَلَا تُوَلُّوهُمْ الْأَدْبَارَ وَمَنْ يُوَلِّهِمْ يَوْمَئِذٍ دُبُرَهُ إِلَّا مُتَحَرِّفًا لِقِتَالٍ أَوْ مُتَحَيِّزًا إِلَى فِئَةٍ فَقَدْ بَاءَ بِغَضَبٍ مِنْ اللَّهِ وَمَأْوَاهُ جَهَنَّمُ وَبِئْسَ الْمَصِيرُ  (8·15-16)



O you who believe! When you meet those who disbelieve in a battlefield, never turn your backs to them. And [you should know that] whoever turns his back to them on such a day – unless it be a stratagem of war, or to retreat to a part of his army, – he indeed has drawn upon himself wrath from Allah. And his abode is Hell, and worst indeed is that destination!  (8·15-16)


While explaining these verses, Imam Amin Ahsan Islahi, writes1:


Now the Muslims are being given directives regarding imminent wars. They are told that when they encounter the enemy army in formal warfare, they must never turn their backs. This directive has been given in the light of the background delineated earlier in which the Almighty had promised divine help. It is an anathema for people who have the support of Allah and His angels to run away from the battlefield.
‘وَمَنْ يُوَلِّهِمْ يَوْمَئِذٍ دُبُرَهُ’: in such a situation, those who desert the battlefield would invite the wrath of God and Hell shall be their abode. This shows that the crime is no less than the crime of apostasy and disbelief. Obviously, the severity of this crime hinges on the fact that, at times, a person who runs away from the battle field poses a great threat for the whole army and sometimes for the whole Muslim collectivity.
There is a question . Did any of the three future claiment of leadership of the Muslim Ummah confronted any one of the kuffar of the Qoraish . O K you don’t have the valour , courage or strength to take to the Kuffar who had brought even their women to backup, encourage and even fight if needed . O K you were coward and  could not collect the strength to fight , but when the bogie of Rasool e Akram (saaws ) Killed  was raised in the confusion that a sahabi who looked very  much like the Prophet of Islam fell to his injuries , the three future claiment of Khilafat ran away from the battle field in unison , Saheeh Bokhari reports that Omar bin Khattab ran miles without looking back  and was hopping
While reading the above , sincerly tell me what was the role of the three rulers in the 2nd most important battle between the Madinah’s Muslim’s under the leadership of Hazrat Mohammad Mustafa (saaws) and the Kuffare Qoraish of Makkah under the leader ship of Abu Sufiyan the father of Moaviah whose son Fasiq o Fajir Yazeed Maloun inhalated the entire family and friends of the Farzand e Rasool Hazrat Imam Husain (a s) save his one son to keep the Imamat continue .
 Abu Bakr also ran away but came back by the time millie subsided and he came to know that indeed Rasool Allah (saaws) was alive and after finishing the kaffereen  quickly Haider e Karrar Hazrat Ali (a)took care of his master and took him to a place of safety where his wife Janab e Fatemah (s) , the Nabi’s daughter also reached and did the nursing of his wounds .While the father inlaws were nowhere around . Hazrat Usman bin Affan had fearfully gone so far that he returned only after three days when came to know that indeed the army of the Makkans Kaffirs have gone back defeated and Rasool e Kareem was safe and well.      
   Now in the light of the above Aayat what would you say about the character, valour, Eemaan and guidance of the 3 Kholfa e salasah. Let not the Ummah of any maslak decide the case but an outsider historian who have studied and researched and came to a conclusion like Professor Wilfred Madelung whose book winned him the prestigious ”Best Book of the Year Award of 1997” for his ” Successors of Prophet Mohammad (s) ”
Zaheer Husain Khan.