At-Taubah - 9:43

عَفَا اللّهُ عَنكَ لِمَ أَذِنتَ لَهُمْ حَتَّى يَتَبَيَّنَ لَكَ الَّذِينَ صَدَقُواْ وَتَعْلَمَ الْكَاذِبِينَ
[9:43]
Allah pardon you! Why did you give them leave until those who spoke the truth had become manifest to you and you had known the liars?
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?
Allah forgive thee (O Muhammad)! Wherefor didst thou grant them leave ere those who told the truth were manifest to thee and thou didst know the liars?