بَل ظَنَنتُم أَن لَن يَنقَلِبَ الرَّسولُ وَالمُؤمِنونَ إِلىٰ أَهليهِم أَبَدًا وَزُيِّنَ ذٰلِكَ في قُلوبِكُم وَظَنَنتُم ظَنَّ السَّوءِ وَكُنتُم قَومًا بورًا

You assumed that the Messenger and the believers would not return to their families, which delighted your hearts. You harbored malicious thoughts, and thus, became doomed people.