He bought shares by means of a riba-based loan; what should he do?

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Check below answers in case you are looking for other related questions:
How could the Islamic states allow the development of riba-based banks?
Ruling on tawarruq sales

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Related Answers:
Borrowing from a riba-based bank in order to buy a house
He has a debt and he wants to go for Hajj
Buying items by instalments from Sab Amanah
How could the Islamic states allow the development of riba-based banks?
Ruling on tawarruq sales

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