Hadith.3774 - Abdullah ibn Muskan narrated from Al-Halabi, from Abu Abdillah : Regarding a man who purchased food with dirhams from another man, took half of it, and then returned later - after the price of the food had either increased or decreased. Imam said: "If, on the day he purchased it, they agreed on a fixed price, then that price applies. But if no price was fixed, then it is sold at the price of the day it is taken." Imam also said about a man who had two types of the same food, priced equally, but one was better than the other, and he mixed them together and sold them at one price: "It is not permissible for him to do that, as it deceives the Muslims, unless he makes it clear (to the buyer)."