He has a restaurant where he sells alcohol, and he gave her the second part of the mahr from this money

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Check below answers in case you are looking for other related questions:
Is it permissible for him to ask the company for accommodation if it will be built with a riba-based loan?
A company is offering a riba-based loan to its employees

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Related Answers:
Is it permissible to accept a gift from a man who deals in riba?
A father puts the condition that he should get something for himself in addition to the mahr which is agreed to for his daughter at the time of the wedding contract (nikaah)
The marriage contract was done without any mention of the mahr (dowry)
Is it permissible for him to ask the company for accommodation if it will be built with a riba-based loan?
A company is offering a riba-based loan to its employees

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