It was narrated that Ibn 'Umar said: "I used to sell camels at Al-Baqi and I would sell Dinars in exchange for Dirhams. I came to the Prophet in the house of Hafsah and said: 'O Messenger of Allah, I want to ask you: I sell camels in Al-Baqi and I sell Dinars in exchange for Dirhams. He said: 'There is nothing wrong with it if you take the price on that day, unless you depart when there is still unfinished business between you both (buyer and seller)."'