سُورَةُ التَّوۡبَةِ
At-Tawba·9:43
عَفَا اللَّهُ عَنْكَ لِمَ أَذِنْتَ لَهُمْ حَتَّىٰ يَتَبَيَّنَ لَكَ الَّذِينَ صَدَقُوا وَتَعْلَمَ الْكَاذِبِينَ٤٣
May God pardon thee [O Prophet]! Why didst thou grant them permission [to stay at home] ere it had become obvious to thee as to who was speaking the truth, and [ere] thou camest to know. [who were] the liars?