Quran 9:43 from Surah At-Tawba on Divine Marvels.
عَفَا ٱللَّهُ عَنكَ لِمَ أَذِنتَ لَهُمۡ حَتَّىٰ يَتَبَيَّنَ لَكَ ٱلَّذِينَ صَدَقُواْ وَتَعۡلَمَ ٱلۡكَٰذِبِينَ
English translation: (May) Allah forgive (May) Allah forgive you Why (did) you grant leave to them until (became) evident to you those who were truthful and you knew the liars
Transliteration: afa al-lahu anka lima adhinta lahum hatta yatabayyana laka alladhina sadaqu wata'lama al-kadhibina