﴿ عَفَا ٱللَّهُ عَنكَ لِمَ أَذِنتَ لَهُمْ حَتَّىٰ يَتَبَيَّنَ لَكَ ٱلَّذِينَ صَدَقُوا۟ وَتَعْلَمَ ٱلْكَٰذِبِينَ ﴾

“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?”

(Allah forgive thee) O Muhammad! (Wherefore didst thou grant them leave) give leave to the hypocrites to stay behind and not go to Tabuk (ere those who told the Truth were manifest to you) until those who are genuine in their faith are manifest to you upon going forth with you (and thou didst know the liars) about their faith, when they fail to set forth with you without leave?