Allah has set a seal on their hearts and on their hearings, (i.e. they are closed from accepting Allah's Guidance), and on their eyes there is a covering. Theirs will be a great torment.
And of mankind, there are some (hypocrites) who say: "We believe in Allah and the Last Day" while in fact they believe not.
They (think to) deceive Allah and those who believe, while they only deceive themselves, and perceive (it) not!
In their hearts is a disease (of doubt and hypocrisy) and Allah has increased their disease. A painful torment is theirs because they used to tell lies.
And when it is said to them: "Make not mischief on the earth," they say: "We are only peacemakers."
Verily! They are the ones who make mischief, but they perceive not.
And when it is said to them (hypocrites): "Believe as the people (followers of Muhammad Peace be upon him , Al-Ansar and Al-Muhajirun) have believed," they say: "Shall we believe as the fools have believed?" Verily, they are the fools, but they know not.
And when they meet those who believe, they say: "We believe," but when they are alone with their Shayatin (devils - polytheists, hypocrites, etc.), they say: "Truly, we are with you; verily, we were but mocking."
Allah mocks at them and gives them increase in their wrong-doings to wander blindly.
These are they who have purchased error for guidance, so their commerce was profitless. And they were not guided.
Their likeness is as the likeness of one who kindled a fire; then, when it lighted all around him, Allah took away their light and left them in darkness. (So) they could not see.
They are deaf, dumb, and blind, so they return not (to the Right Path)."
(Surah 2: Al-Baqarah (The Cow); verses 6-18)