[Surah Al-Qalam 68:4]
He will not reciprocate evil with evil - Allah commanded His Prophet ﷺ to reciprocate evil with goodness.
"Repel evil with that which is good and you will find the one who harbored hatred against you will be your close friend."
This verse elaborates one of the qualities of the last Prophet ﷺ as mentioned in the previous Divine Books. This testifies the authenticity of Qur’an as well as qualifies the prophethood of Mohammed ﷺ.
The Qur’an rightly says:
"This book testifies what is written in your book - Whatever was foretold by previous prophets like Moses and Jesus (peace be upon them)."
He will be forgiving and magnanimous - These are two different traits. For example; If you reconcile two quarrelling men, they will accept the settlement for the time being, but one of them would hold the grudge and hope to take revenge on the day of Qiyamah. But the Prophet ﷺ , was not like this.. If he forgave someone, he would forgive him wholeheartedly and would not expect him to be punished in the court of Allah as well.
Sahih Muslim narrates an interesting Hadith:
One day the Prophet ﷺ raised up his hands and prayed - “If I have hurt any of my followers through my harsh words or hands, then change it into a blessing for him”.Sahih Muslim
The same command is given to him in the Qur’an:
"Hold fast to forgiveness."
The height of his noble Akhlaq (character) is directly proportional to the high level of his generosity. Our Prophet ﷺ never took revenge from his enemies for his own self.