Al-Fatir (The Initiator of Creation)
Surah 35 · Verse 8
Then , is he to whom the evil of his deed is made fair seeming, so that he sees it (as) good, (like one, who is really good)? So Allah certainly leaves to stray whom He wills and guides whom He wills. So do not let your soul waste away regretting over them. Allah is certainly the Knower of the work they do.
Prophet Muhammed (PBH) is advised not to regret over the infidels because it is Allah (SWT) who guides or leaves to stray whom He wills.
