Although these sorts of people show themselves to you Muslims in the form of friend, they are of surety your real enemies and of course Allah has full knowledge of All. What enmity can be more and higher, that they do their best to rush against your salvation and to ruin your prosperity? They do that hypocritically through the ties of friendship, and if that trick didn't work, they adhere to slander and ill-speaking of you, with the aim of leading you astray, and deviate you from your straight path of truth. You need not to have any fear of them because Allah is enough as a protector, and as helper for you.