Forgiving and forgetting what other people did is a virtue.However,the holder of a right may refuse to give up his right. That is to say, he may not excuse that person in this world. He may ask for his right in the next world. Nevertheless, granting forgiveness to a Muslim person is a grand good deed and he is given more than his right in the hereafterIt is narrated by Hazrat Aisha that our Prophet never tried to get personal revenge.
He used responded with favors to the wrongdoings. He always had acts of kindness and an elevated soul. In all his lifetime, the Jewish people, unbelievers and the munafiqs (hypocrites) who set traps for him got their shares of his compassion and high merits. In the works that give accounts of his life, he is said to have given his shirt as a shroud for Abdullah bin Ubayy the leader of the munafiqs when he died. We can also observe his good and fair conducts towards the Jewish despite all their tricks. And after all of those endeavors against them, we are able to find out that when he stepped in Mecca, he said to them “you can go and all of you are free from now on” and addressed the unbelievers with the verses “This day let no reproach be (cast) on you: Allah will forgive you, and He is the Most Merciful of those who show mercy! (the Qur’an, -Joseph (Yusuf), 92 ( 12: 92) Moreover, we can realize that how the verse “Hold to forgiveness; command what is right; But turn away from the ignorant” can be put into practice (the Qur’an, The Heights (Al-Aráf) (7: 199), when we read that for those throwing stones at him and scorning, attempting to kill him, he prayed to Allah “Oh My God, forgive them because they do not know” And also, we can understand his words better “My Lord ordered me to excuse my enemies though I have the enough power to take revenge, to keep the contact with the ones who cut their relations with me, and give away to those who did not give anything to me”
God Almighty orders in Aale-Imran surah in the verse 159 “It is part of the Mercy of Allah that thou dost deal gently with them. Wert thou severe or harsh-hearted, they would have broken away from about thee: so pass over (their faults), and ask for (Allah's) forgiveness for them; and consult them in affairs (of moment). (the Qur’an, Aal-e-Imran, 3:159).