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.

'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.

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