Hypocrites

Some claim belief but do not really believe
8. Of the people there are some who say: "We believe in God and the Last Day;" but they do not (really) believe.

(Surah 2, The Cow)

Some claim to make peace, but they make mischief
11. When it is said to them: "Make not mischief on the earth," they say: "Why, we only Want to make peace!"

12. Of a surety, they are the ones who make mischief, but they realise (it) not.

(Surah 2, The Cow)

Some claim belief, but express unbelief when with evil ones
8. Of the people there are some who say: "We believe in God and the Last Day;" but they do not (really) believe.

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14. When they meet those who believe, they say: "We believe;" but when they are alone with their evil ones, they say: "We are really with you: We (were) only jesting."

(Surah 2, The Cow)

Some claim the believers are fools, but they are the fools and do not know
8. Of the people there are some who say: "We believe in God and the Last Day;" but they do not (really) believe.

...

13. When it is said to them: "Believe as the others believe:" They say: "Shall we believe as the fools believe?" Nay, of a surety they are the fools, but they do not know.

(Surah 2, The Cow)

False believers will not deceive God or true believers
8. Of the people there are some who say: "We believe in God and the Last Day;" but they do not (really) believe.

9. Fain would they deceive Allah and those who believe, but they only deceive themselves, and realise (it) not!

(Surah 2, The Cow)