الآية رقم (80) - تَرَى كَثِيرًا مِّنْهُمْ يَتَوَلَّوْنَ الَّذِينَ كَفَرُواْ لَبِئْسَ مَا قَدَّمَتْ لَهُمْ أَنفُسُهُمْ أَن سَخِطَ اللّهُ عَلَيْهِمْ وَفِي الْعَذَابِ هُمْ خَالِدُونَ
(80) - (You see many of them becoming allies of those who disbelieved. How wretched is that which they have put forth for themselves in that Allah has become angry with them, and in the punishment they will abide eternally.)
As did the Jews during the Battle of the Trench, where the Banu al-Nadir conspired with the Arab tribes against the Prophet (saws) and his companions. The result was that they deserved the wrath of Allah (swt) and He expelled them from His mercy. Therefore, they will be in in the punishment eternally.