Can he buy a car from an auction held by the riba-based bank, on which the owner defaulted on payment of what he owed?

Ways of obtaining people’s emails for the purpose of marketing products to them via e-mail, and the ruling thereon

The heirs agreed to sell the apartment to one of their number, but he did not pay anything, then they sold it to another heir. Is that sale valid?

Tawliyah transaction (reselling at cost price)

Is it permissible to keep an item if it arrives with a defect, and to ask the seller for a refund and not return the item?

Selling at different prices

Is buying expensive perfume regarded as extravagance?

A trader is asking whether it is permissible for him to remove the tradename of a product or replace it with another name

Dealing with luggage left behind by passengers in the airport

What is the ruling if the price was unfair, so he cancelled the deal, but there is a penalty for the one who cancels it?