The love of Umar r.a

At the Battle of Uhud, Prophet Mohammad S.A.W got injured and was hit on cheek bone,and lost his two teeth. He, Mohammad S.A.W fell Unconscious.

During this incident, the rumors were spread out that Prophet Mohammad S.A.W got Martyr. Upon hearing this,His Companion Umar R.A went in distress and throw away his sword and sat on ground thinking that Prophet of Allah  no longer exists,so its useless to fight now,for whom i should fight now?and on this act of Umar R.A the Following verses were Revealed.

"Muhammad is not but a messenger. [Other] messengers have passed on before him. So if he was to die or be killed, would you turn back on your heels [to unbelief]? And he who turns back on his heels will never harm Allah at all; but Allah will reward the grateful." 3:144 

Later on after the incident of battle of Uhud When Prophet Mohammad S.A.W passed away and the news of Demise of Prophet Mohammad S.A.W reached to Umar R.A,He took his sword and said that i will detach the head of the person who says Prophet Mohammad S.A.W is Dead.He couldn't enter the home of Mohammad S.A.W to check if he is alive or dead.So Abu Bakr Siddique R.A went in bedroom of Mohammad S.A.W and confirmed the death of Mohammad S.A.W.

When Abu Bakr Siddiqe R.A came out of the Room of Mohammad S.A.W... he said the above Verses of Surah Al-Imran to Calm down Umar R.A.

He calmed down eventually but tears welled up in his eyes when the realization hit him.. Prophet Muhammad, peace be upon him was no longer with him in this dunya. He had to accept Allah's will. 

...Muhammad is not but a messenger. [Other] messengers have passed on before him. So if he was to die or be killed, would you turn back on your heels [to unbelief]? And he who turns back on his heels will never harm Allah at all; but Allah will reward the grateful...