Allah's mercy and forgiveness

وَمَن يَعْمَلْ سُوٓءًا أَوْ يَظْلِمْ نَفْسَهُۥ ثُمَّ يَسْتَغْفِرِ ٱللَّهَ يَجِدِ ٱللَّهَ غَفُورًا رَّحِيمًا

And whoever does a wrong or wrongs himself but then seeks forgiveness of Allāh will find Allāh Forgiving and Merciful.

وَٱلَّذِينَ عَمِلُوا۟ ٱلسَّيِّـَٔاتِ ثُمَّ تَابُوا۟ مِنۢ بَعْدِهَا وَءَامَنُوٓا۟ إِنَّ رَبَّكَ مِنۢ بَعْدِهَا لَغَفُورٌ رَّحِيمٌ

But those who committed misdeeds and then repented after them and believed - indeed your Lord, thereafter, is Forgiving and Merciful.

رَبِّ إِنَّهُنَّ أَضْلَلْنَ كَثِيرًا مِّنَ ٱلنَّاسِ ۖ فَمَن تَبِعَنِى فَإِنَّهُۥ مِنِّى ۖ وَمَنْ عَصَانِى فَإِنَّكَ غَفُورٌ رَّحِيمٌ

My Lord, indeed they have led astray many among the people. So whoever follows me - then he is of me; and whoever disobeys me - indeed, You are [yet] Forgiving and Merciful.