God has pardoned you: why did you give them permission (to stay behind), before you could distinguish those who are truthful from the liars?
عَفَا اللَّهُ عَنكَ لِمَ أَذِنتَ لَهُم حَتّىٰ يَتَبَيَّنَ لَكَ الَّذينَ صَدَقوا وَتَعلَمَ الكٰذِبينَ
‘afal laahu ‘anka lima azinta lahum hattaa yatabai yana lakal lazeena sadaqoo wa ta’lamal kaazibeen