Allah's ultimate authority over Iblis

ثُمَّ لَـَٔاتِيَنَّهُم مِّنۢ بَيْنِ أَيْدِيهِمْ وَمِنْ خَلْفِهِمْ وَعَنْ أَيْمَـٰنِهِمْ وَعَن شَمَآئِلِهِمْ ۖ وَلَا تَجِدُ أَكْثَرَهُمْ شَـٰكِرِينَ

Then I will come to them from before them and from behind them and on their right and on their left, and You will not find most of them grateful [to You]."