وَيُعَذِّبَ الْمُنَافِقِينَ وَالْمُنَافِقَاتِ وَالْمُشْرِكِينَ وَالْمُشْرِكَاتِ الظَّانِّينَ بِاللَّهِ ظَنَّ السَّوْءِ ۚ عَلَيْهِمْ دَائِرَةُ السَّوْءِ ۖ وَغَضِبَ اللَّهُ عَلَيْهِمْ وَلَعَنَهُمْ وَأَعَدَّ لَهُمْ جَهَنَّمَ ۖ وَسَاءَتْ مَصِيرًا
“Also [so that] He may punish hypocrite men and women and polytheistic men and women, who harbor evil thoughts of Allah. May ill-fate befall them! Allah is displeased with them. He has condemned them and prepared for them Hell. What an evil destination!”
This ayah is part of Surah al-Fath, revealed -- as this event's own significance note states -- "concerning this incident" (Q48:1), the Treaty of Hudaybiyyah.