Al-An'am 6:54

Wa-itha jaaka allatheenayu/minoona bi-ayatina faqul salamunAAalaykum kataba rabbukum AAala nafsihi arrahmataannahu man AAamila minkum soo-an bijahalatin thumma tabamin baAAdihi waaslaha faannahu ghafoorun raheem

And when those come to you who believe in Our verses, say, "Peace be upon you. Your Lord has decreed upon Himself mercy: that any of you who does wrong out of ignorance and then repents after that and corrects himself - indeed, He is Forgiving and Merciful."

When those who believe in Our verses come to you, say to them, “Peace on you. Your Lord has prescribed for Himself mercy, so that if any one of you does an evil deed out of ignorance and thereafter repents and mends his ways, then (you will see that) He is Most-Forgiving, Very-Merciful.