Hypocrisy

{61:2} O you who believe! Why do you say that which you do not do?

{61:3} it is most hateful to Allah that you should say that which you do not do.

{107:4} so woe to the praying ones,

{107:5} who are unmindful of their prayers,

{107:6} who do (good) to be seen,

{63:1} When the hypocrites come to you, they say: We bear witness that you are most surely Allah's Messenger; and Allah knows that you are most surely His Messenger, and Allah bears witness that the hypocrites are surely liars.

{2:11} and when it is said to them, do not make mischief in the land, they say: We are but peace-makers.

{2:12} now surely they themselves are the mischief makers, but they do not perceive.

{4:145} surely the hypocrites are in the lowest stage of the fire and you shall not find a helper for them.

Comment: The Hypocrites mentioned in the Quran are those people who pretend to be Muslims.