Surah Ali 'Imran 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].

Translation: Saheeh International

Tafsir

It was by the mercy of God that you O Muhammad (s) were lenient with them that is that you showed indulgence toward them when they disobeyed you; had you been harsh ill-natured and fierce of heart brutish and coarse towards them they would have dispersed split away from about you. …

Excerpt from Tafsir al-Jalalayn, commentary on 3:159, via Quran.com. The reader has the full commentary and 9 more tafsirs.