Ya-Sin 36:9

WajaAAalna min bayni aydeehim saddanwamin khalfihim saddan faaghshaynahum fahum la yubsiroon

And We have put before them a barrier and behind them a barrier and covered them, so they do not see.

And We have placed a barrier in front of them and a barrier behind them, and (thus) they are encircled by Us; so they do not see.