Some of the desert Arabs around you are hypocrites, and so are some of the residents of Madinah, who are fanatical in their hypocrisy. You do not know them, but We know them. Soon We shall give them double punishment: then they shall be turned to the most severe chastisement.
Meaning:-
Hypocrite (hypocrisy): a person who puts on a false appearance of virtue or religion.
Fanatical: holding extreme beliefs that may lead to unreasonable or violent behaviour:
Chastisement is the act of scolding or punishing someone, corporal punishment; a beating.