How is a wife to spend from her husband’s money if his money is mixed between unlawful and lawful?

It is permissible to deal with a person who possesses mixed wealth, but it is preferable to avoid him for someone who is not in need of it. The recipient should intend that he is taking from his permissible wealth. The wife should advise her husband who has acquired unlawful wealth and warn him of God's punishment so that he may repent.