Quran on forgiveness...

Correct and courteous words accompanied by forgiveness are better than sadaqa followed by insulting words. Allah is Rich Beyond Need, All-Forbearing. (Surat Al-Baqara, 263)

those who give in times of both ease and hardship, those who control their rage and pardon other people – Allah loves the good-doers – (Surat Al ‘Imran, 134)

“The repayment of a bad action is one equivalent to it. But if someone pardons and puts things right, his reward is with Allah…” (Qur’an, 42:40)

“…. But if you pardon and exonerate and forgive, Allah is Ever-Forgiving, Most Merciful.” (Qur’an, 64: 14)