Is it permissible to live with someone who works in a usurious bank, and is there any sin upon us in eating and drinking with him?

It is not permissible to deal with someone who works in a usurious bank, whether through partnership, accepting a gift, or similar interactions, regardless of whether there is an urgent necessity for his work. However, living with him is permissible, and he should be advised to leave the usurious work if he is not compelled to it.