‏البيوع : Hadeeth No:3636 Abu Huraira (Allaah be pleased with him) reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: lie who buys a goat having its udder tied up has the option to return it within three days. If he returns it he should pay a sa' of dates. Wheat is not essential....

‏البيوع : Hadeeth No:3688 Bushair b. Yasar reported on the authority of some of the Companion of Allaah's Messenger (sallAllaahu alayhi wa sallam) that he exempted the transactions, of 'ariyya (from the direct exchange of one kind) after measuring the dry dates (in exchange for fresh dates)....