Mercy
Surah (21:107)
وَمَآ أَرْسَلْنَـٰكَ إِلَّا رَحْمَةً لِّلْعَـٰلَمِينَ« And We have not sent you, [O Muḥammad], except as a mercy to the worlds. »
Surah (12:87)
يَـٰبَنِىَّ ٱذْهَبُوا۟ فَتَحَسَّسُوا۟ مِن يُوسُفَ وَأَخِيهِ وَلَا تَا۟يْـَٔسُوا۟ مِن رَّوْحِ ٱللَّهِ ۖ إِنَّهُۥ لَا يَا۟يْـَٔسُ مِن رَّوْحِ ٱللَّهِ إِلَّا ٱلْقَوْمُ ٱلْكَـٰفِرُونَ« O my sons, go and find out about Joseph and his brother and despair not of relief from Allāh. Indeed, no one despairs of relief from Allāh except the disbelieving people." »
Surah (3:159)
فَبِمَا رَحْمَةٍ مِّنَ ٱللَّهِ لِنتَ لَهُمْ ۖ وَلَوْ كُنتَ فَظًّا غَلِيظَ ٱلْقَلْبِ لَٱنفَضُّوا۟ مِنْ حَوْلِكَ ۖ فَٱعْفُ عَنْهُمْ وَٱسْتَغْفِرْ لَهُمْ وَشَاوِرْهُمْ فِى ٱلْأَمْرِ ۖ فَإِذَا عَزَمْتَ فَتَوَكَّلْ عَلَى ٱللَّهِ ۚ إِنَّ ٱللَّهَ يُحِبُّ ٱلْمُتَوَكِّلِينَ« So by mercy from Allāh, [O Muḥammad], you were lenient with them. And if you had been rude [in speech] and harsh in heart, they would have disbanded from about you. So pardon them and ask forgiveness for them and consult them in the matter. And when you have decided, then rely upon Allāh. Indeed, Allāh loves those who rely [upon Him]. »
Divine mercy is a central concept of the Quran. The root ر-ح-م also gives Ar-Rahman (the Most Gracious) and Ar-Rahim (the Most Merciful).