﴿ ٱتَّخَذُوٓا۟ أَيْمَٰنَهُمْ جُنَّةًۭ فَصَدُّوا۟ عَن سَبِيلِ ٱللَّهِ فَلَهُمْ عَذَابٌۭ مُّهِينٌۭ ﴾

“they have made their oaths a cover [for their falseness], and thus they turn others away from the path of God: hence, shameful suffering awaits them.”

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.