What is the ruling on the following: - Making a price offer in the name of a usurious bank or for a client, with the knowledge that they are funded by a usurious bank? - Accepting payment by a check issued from a usurious bank? - A staff member giving the client the company's account number in a usurious bank for transferring the due amount – is this considered writing down usury?

It is not permissible to offer a price quote to an interest-based bank or to a person known to be purchasing the quoted item with interest, because this constitutes aiding in sin. However, accepting payment by a check issued from an interest-based bank is permissible. Similarly, there is no harm in an employee giving a client their company's account number at an interest-based bank for transferring a due amount, and the sin falls upon the one who opened the account at the interest-based bank.