‏البيوع : Hadeeth No:3660 Ibn Umar reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: There is no transaction between two persons entering a transaction until they separate, but only when there is an option to annul it....

‏الحج : Hadeeth No:3020 This hadith has been narrated on the authority of Abd al-Karim al-Jazari with the same chain of transmitters....