Imam Ali ibn Abu Talib's (as) behaviour towards his Foes (Enemies)

Talha bin Abu Talha was not only a bitter enemy of Islam, but was personal enemy of Holy Prophet Muhammad (saw) and Imam Ali ibn Abu Talib (as). His exertions to harm these two and their mission is a legion. In the battle of Uhud he was the flag bearer of the army of Quraish. Imam Ali ibn Abu Talib (as) faced him and in a hand to hand encounter dealt him such a severe blow that he reeled and fell down. Imam Ali ibn Abu Talib (as) left him like that and walked away from him. Many Muslim warriors ran up to Imam Ali ibn Abu Talib (as) and advised him to finish Talha bin Abu Talha, saying that he was Ali's worst enemy, Imam Ali ibn Abu Talib (as) replied:
Enemy or no enemy he cannot defend himself now, and I cannot strike a man who is not in a position to defend himself. If he survives he is welcome to live as long as his life lasts.

Cold Drink for Enemies in Battle of Camel (Jange Jamal)

In the battle of Camel (Jange Jamal) in the thick of the encounter his slave Qambar brought some sweet syrup saying:
My Master the sun is very hot you have been constantly fighting, have a glass of this cold drink to refresh yourself.

Imam Ali ibn Abu Talib (as) looked around himself and replied:

Shall I refresh myself when hundreds of people around me are lying

Zulfiqar - Sword Of IMAM ALI a.s

 Zulfiqar (‘bifurcated’) is a well-known sword of Islamic history owned by Hazrat Ali, by many accounts, Muḥammad (PBUH) presented Zulfiqar to a young Ali at the Battle of Uhud. During the battle, Ali struck one of the fiercest adversaries, breaking both his helmet and his shield. Muhammad (PBUH) remarked “There is no hero but Ali and no sword except Zulfiqar”. By most historical accounts, Ali used the sword at the Battle of the Trench to cut a fierce Meccan opponent and his shield in two halves. The opponent was Amr ibn Abdawud, whose strength was often compared to that of a thousand men. No one had dared to fight him except Ali, who killed him with one powerful blow. Though Amr wore strong armor and carried powerful weapons, he is said to have been no match to Ali and his sword. The scimitar is one of the oldest and best known symbols of Islam. The sword was also used in the Battle of Karbala by Imam Hussain, and as a result it is seen as a symbol of honor and martyrdom. And it is now believed by the Shias to be in the possession of Imam Mehdi.