Surah Ya-Sin (36:9)

وَجَعَلْنَا مِنۢ بَيْنِ أَيْدِيهِمْ سَدًّا وَمِنْ خَلْفِهِمْ سَدًّا فَأَغْشَيْنَٰهُمْ فَهُمْ لَا يُبْصِرُونَ

And We have placed, in front of them, a barrier, and behind them, a barrier; then We have overcast them, so they do not see.