surah albaqarah verse# 8 and 9

وَمِنَ النَّاسِ مَن يَقُولُ آمَنَّا بِاللّهِ وَبِالْيَوْمِ الآخِرِ وَمَا هُم بِمُؤْمِنِينَ﴿2:8﴾
(2:8) Then there are some who say, "We believe in Allah and the Last Day", whereas they do not believe at all.

يُخَادِعُونَ اللّهَ وَالَّذِينَ آمَنُوا وَمَا يَخْدَعُونَ إِلاَّ أَنفُسَهُم وَمَا يَشْعُرُونَ﴿2:9﴾
(2:9) They thus try to deceive Allah and the Believers, but they succeed in deceiving none except themselves and they realize it not *11
*11. These people delude themselves that their hypocritical behaviour will profit them when in fact it will prove harmful both in this world and the Next. A hypoctite may be able to fool people for a while, but it does not last long; his hypocrisy is ultimately seen through. As for the Next Life, it is obvious that his claim to be a true believer is contradicted by his own actions and is thus quite worthless.