A hardline Islamic preacher who promotes Sharia law says Muslim men have a duty to stop women in their family from going to university.

Nassim Abdi, from western Sydney, said young Muslim women in their late teens and early twenties were at risk of having premarital sex if they delayed marriage to finish a degree.

'There is nothing wrong with a woman getting an education, especially if it's needed,' he said.

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Hardline Muslim preacher Nassim Abdi says university makes women have premarital sex

'There is nothing wrong with a person delaying marriage if there's an appropriate reason.

'But when you know this step is going to lead to the disobedience of Allah, then upon you dear brother is to stop that if you can.

'Otherwise, you will be held responsible.'

The Sunni fundamentalist, from the Ahlus Sunnah Wal Jamaah Association at Auburn in Sydney's west, used the Islamic legal term for premarital sex, Zinnah, to condemn the idea of a woman unnecessarily going to university.

Nassim Abdi says Muslim men had a duty to prevent female relatives from going to university

The Ahlus Sunnah Wal Jamaah Association preacher mocked letting women finish studying

'How many people ended up committing Zinnah because we wanted our reputation to be held up? We wanted a master's degree for our daughter who is never going to use it,' he said.

Mr Abdi, who has previously condemned Muslim women for showing their ears in public and letting children hear music in the car, mocked those who believed their daughters needed to finish their degrees before getting married.

'How many a time, a man comes to ask for a daughter's hand?,' he said.

'"No, she's too young." Too young meaning how old? Twelve, thirteen, maybe too young. The woman's 18, 19, 21 years old, what do you mean too young?

'If a woman is physically and mentally and emotionally is able to get married, then why prevent her? "No, she has to finish her studies".'

Mr Abdi preaches an ultra-conservative version of Salafism, derived from Saudi Arabia, at a mosque which is upstairs from the Bukhari House Islamic Bookstore.