Revenge is bad education, it stops you from succeeding. It is a thought used to justify injuries, which varies from speaking ill, whipping the other cheek to killing and encouraging others to kill.
A poetess named “Asma Bint Marwan” who belonged to the Aws tribe, she had a dislike to Islam. She wrote a poem composed of how one can trust foolishly a stranger (Mohammad) who fought his own people.
“Fucked men of Malik and of Nabit and of Aws, fucked men of Khazraj
You obey a stranger who does not belong among you
Who is not of Murad, nor of Madh’hij
Do you, when your own chiefs have been murdered, put your hope in him
Like men greedy for meal soup when it is cooking?
Is there no man of honor who will take advantage of an unguarded moment
And cut off the gulls’ hopes? “
On hearing these lines. Mohammad send “Umayr Ibn Adi” to the writer’s home, while she lay sleeping surrounded by her young children and a suckling baby at her breast, the man plunged his sword into the poetess. In the next day, the killer went to the mosque for the Morning Prayer and in the Muslim gathering, Mohammad praised the killer for his service to Allah and his prophet.
Another example: After his success in the battle of badir which killed forty. Nine meccans, their heads were casted, gathered and placed at the prophet’s feet. Mohammad was so happy. He cried out saying “This is more acceptable gift than having the best camel in all Arabia”. Then began a series of assassinations as Muhammad, feeling more confident, he moved against his enemies to settle his old scores, and ruthlessly establish his power. First he ordered the execution of al-Nader, he who had scoffed at Muhammad during his days at Mecca and had told better stories than the Prophet himself. Here is how the murder of another prisoner, “Ocba” took place:
Ocba was ordered out for execution. He ventured to expostulate, and demand why he should be treated more rigorously than the other captives. “Because of thine enmity to God and his Prophet,” replied Mahomet. “And my little girl!” cried Ocba, in the bitterness of his soul—“who will take care of her?” “Hell-fire!” exclaimed the Prophet; and on the instant the victim was hewn to the ground. “Wretch that thou was!” he continued, “and persecutor! unbeliever in God, in his Prophet, and in his book! I give thanks unto the Lord that hath slain thee, and comforted mine eyes thereby.”