﴿ أَعَدَّ ٱللَّهُ لَهُمْ عَذَابًۭا شَدِيدًا ۖ إِنَّهُمْ سَآءَ مَا كَانُوا۟ يَعْمَلُونَ ﴾

“God has readied for them suffering severe [in the life to come]. Behold, evil indeed is what they are wont to do:”

The hypocrites of Madinah, who were at that time living in the community of Islam, joined hands with other hostile tribes. This is always true of those who are unable to accept the Truth whole-heartedly. Such people are apparently in consonance with everyone else but, in reality, they are loyal only to their own interests, despite having given assurances on oath of their being devotees of the Truth.