What is the ruling on buying a car under the microphone, where the down payment is paid, and then selling it in its place for a higher price?

Question:
He says: Honorable Shaykh, may Allah grant you success. I am a car dealer. I buy a car under the microphone, give him a down payment of five hundred, then another person buys it from me for a profit of one thousand. So I transfer it to him in the same place and take the down payment and the profit in the place without paying the full price. Is this sale valid?

Answer:
First, you have not taken possession of the car. You must take possession of it by moving it from the auction place to another place. You have not taken possession of the car, so how can you sell it when you have not taken possession of it? It is still in the auction place.