Az-Zukhruf 43:37

Wa-innahum layasuddoonahum AAani assabeeliwayahsaboona annahum muhtadoon

And indeed, they [i.e., the devils] avert them from the way [of guidance] while they think that they are [rightly] guided

And they (the devils) prevent such people from the (right) way, while they deem themselves to be on the right path,