Sura al-Nisāʾ 4:64

وَمَآ أَرْسَلْنَا مِن رَّسُولٍ إِلَّا لِيُطَاعَ بِإِذْنِ ٱللَّـهِ وَلَوْ أَنَّهُمْ إِذ ظَّلَمُوٓا۟ أَنفُسَهُمْ جَآءُوكَ فَٱسْتَغْفَرُوا۟ ٱللَّـهَ وَٱسْتَغْفَرَ لَهُمُ ٱلرَّسُولُ لَوَجَدُوا۟ ٱللَّـهَ تَوَّابًا رَّحِيمًا

wa-mā arsalnā min rrasūlin illā li-yuṭāʿa bi-idhni allāhi wa-law annahum idh ẓalamū anfusahum jāʾūka fa-astaghfarū allāha wa-astaghfara lahumu l-rasūlu la-wajadū allāha tawwāban raḥīman

We sent not a messenger, but to be obeyed, in accordance with the will of Allah. If they had only, when they were unjust to themselves, come unto thee and asked Allah's forgiveness, and the Messenger had asked forgiveness for them, they would have found Allah indeed Oft-returning, Most Merciful.