‏البيوع : Hadeeth No:3658 Ibn 'Umar (Allaah be pleased with thcm) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: When two persons enter into a transaction, each of them has the right to annul it so long as they are not separated and are together (at the place of transaction) ; or if one gives the other...

‏الزكاة : Hadeeth No:2357 Abu Huraira reported: Whenever the Prophet of Allaah (sallAllaahu alayhi wa sallam) was presented with food, he asked about it, If he was told that it was a gift, he ate out of that, and if he was told that it was a sadaqa he did not eat out of that....