What is the ruling on selling furniture to customers who purchase through usurious financing companies, and what is the ruling on filling out the financing application for the customer?

Filling out a usurious financing application for a customer is impermissible, as it involves assisting in a usurious transaction. The Messenger of Allah, may Allah bless him and grant him peace, cursed the one who consumes Riba, the one who feeds it, its scribe, and its two witnesses, and he said: "They are all equal [in sin]."