رَضُوا بِأَن يَكُونُوا مَعَ الْخَوَالِفِ وَطُبِعَ عَلَى قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ

They are pleased to be with those who stay back, and their hearts have been sealed. So they do not understand.