Al-An‘âm 6:54
وَإِذَا جَاءَكَ الَّذِينَ يُؤْمِنُونَ بِآيَاتِنَا فَقُلْ سَلَامٌ عَلَيْكُمْ ۖ كَتَبَ رَبُّكُمْ عَلَىٰ نَفْسِهِ الرَّحْمَةَ ۖ أَنَّهُ مَنْ عَمِلَ مِنكُمْ سُوءًا بِجَهَالَةٍ ثُمَّ تَابَ مِن بَعْدِهِ وَأَصْلَحَ فَأَنَّهُ غَفُورٌ رَّحِيمٌ ٥٤
Waitha jaaka allatheena yuminoona biayatina faqul salamun AAalaykum kataba rabbukum AAala nafsihi alrrahmata annahu man AAamila minkum sooan bijahalatin thumma taba min baAAdihi waaslaha faannahu ghafoorun raheemun
And when those who believe in Our Revelations come to you, then say (affectionately): ‘Peace be upon you!’ Your Lord has made mercy incumbent upon Himself (as a gracious obligation). So whoever from amongst you commits some evil out of ignorance (or suspension of discretion) but later turns to (Allah in) repentance and amends (himself), then surely He is Most Forgiving, Ever-Merciful. (6:54)