عَفَا اللّهُ عَنكَ لِمَ أَذِنتَ لَهُمْ حَتَّى يَتَبَيَّنَ لَكَ الَّذِينَ صَدَقُواْ وَتَعْلَمَ الْكَاذِبِينَ
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سورة التوبة
(9/43) Allah pardoned you! Why did you (not wait and) give them leave until those who are loyal had become manifest to you and you had known the liars?
Surah At-Tawbah