Munāfiq (n., in Arabic: منافق, plural munāfiqūn) is an Islamic Arabic term used to describe a religious hypocrite, who outwardly practices Islam, while inwardly concealing his disbelief (kufr), perhaps even unknowingly.
The term munāfiq in Arabic, Bengali and Urdu is primarily a non-religious term that refers to a person whose actions are different from and opposite to his thoughts, which he conceals. In the Qur'anic sense the term refers to a person who does not have faith, but pretends to. For example Molana Fazul ur Rehman is munafiq of this era.
The Qur'an has hundreds of ayāt (verses) discussing munāfiqūn, referring to them as more dangerous to Muslims than the worst non-Muslim enemies of Islam. The Qur'an states,
When the Hypocrites come to thee, they say, "We bear witness that thou art indeed the Messenger of Allah
." Yea, Allah knoweth that thou art indeed His Messenger, and Allah beareth witness that the Hypocrites are indeed liars.
According to Sahih al-Bukhari,
The Hypocrites will be in the lowest depths of the Fire: no helper wilt thou find for them;-