Surah At-Taubah (The Repentance), Verse 43

عَفَا اللّٰهُ عَنْكَ لِمَ اَذِنْتَ لَهُمْ حَتّٰی یَتَبَیَّنَ لَكَ الَّذِیْنَ صَدَقُوْا وَتَعْلَمَ الْكٰذِبِیْنَ ۟

Afal laahu 'anka lima azinta lahum hattaa yatabai yana lakal lazeena sadaqoo wa ta'lamal kaazibeen

“Allah give thee grace! why didst thou grant them until those who told the truth were seen by thee in a clear light, and thou hadst proved the liars?”

Quran 9:43 (Yusuf Ali Translation)